bug

UK/bʌɡ/

More pronunciations (1)Fewer pronunciations

Australia/bɐɡ/

bug noun: an insect of the order Hemiptera (the “true bugs”).

Image: Didier Descouens, CC BY-SA 4.0, via Wikimedia Commons

Noun (1)

bug (plural bugs)

An insect of the order Hemiptera (the “true bugs”).
- Several pretty beetles, a superb "bug," and a few nice land-shells were obtained, and I returned in the afternoon well satisfied with my first trial of the promised land.1869, Alfred Russel Wallace, The Malay Archipelago, volume II, London: Macmillan and Co., page 199
(informal, proscribed) Any motile small terrestrial invertebrate, especially one that is seen as a pest.
- Speaking of advertising changes of name, a title by which those lodging-house pests, bugs, are now often known, that of Norfolk Howards, is derived from an advertisement in which one Ephraim Bug avowed his intention of being for the future known as Norfolk Howard.1874, Henry Sampson, A history of advertising, page 278
- Bugs are generated from the moisture of living animals, as it dries up outside their bodies. Lice are generated out of the flesh of animals.1910, Aristotle, translated by D.W. Thompson, The Works of Aristotle: Historia animalium
(informal) Any minibeast.
1. (informal) Any insect.
  - A: Eew, what is that thing?! Is that a bug?! B: No, it's a spider. And don't worry: she's not gonna hurt you.
2. (informal) Any of various species of marine (saltwater or freshwater) crustaceans; e.g. a Moreton Bay bug, mudbug.
  - Bugs, oysters, prawns and crabs […] are plated up on the decks of four side-by-side trawlers bobbing on the calm waters of Trinity Inlet.2021 February, The Road Ahead, Brisbane, page 39, column 2
3. (informal, slang) A trilobite.
  - We asked Harris if he had any recommendations about seeing the famous trilobite digs. He said we should just drive out to his claim in the Wheeler Quadrangle, and it was just fine with him if we dug a few bugs.2007, Kirk Johnson, Cruisin' the Fossil Freeway, page 174
4. (Maine, informal) A lobster.
5. (UK, informal, obsolete, specifically) A bedbug.
(jargon) A problem that needs fixing.
- The software bug led the computer to calculate 2 plus 2 as 3.
- I have the right principle and am on the right track, but time, hard work and some good luck are necessary too. It has been just so in all of my inventions. The first step is an intuition, and comes with a burst, then difficulties arise — this thing gives out and [it is] then that "Bugs" — as such...1878, Thomas P. Hughes, quoting Thomas Edison, Edison to Puskas, 13 November 1878, Edison papers, quoted in American Genesis: A History of the American Genius for Invention, Edison National...
Synonyms:

defect, glitch
A contagious illness, or a pathogen causing it.
- He's got the flu bug.
(informal) An enthusiasm for something; an obsession.
- I caught the skiing bug while staying in the Alps.
- As we rode in the bus in the weird phosphorescent void of the Lincoln Tunnel we leaned on each other with fingers waving and yelled and talked excitedly, and I was beginning to get the bug like Dean.1957 September 5, Jack Kerouac, chapter 1, in On the Road, New York, N.Y.: Viking Press, →OCLC, part 1
(informal) A keen enthusiast or hobbyist.
- His mother had been a bug on astrology, which was why the moment of his birth had been impressed on him so exactly.1961, Fredric Brown, Nightmare in Yellow
- Incidentally, the camera manufacturers have had a new worry—that they might "kill off the hobby," as U.S. Camera magazine put it recently—by automating to the point that real camera bugs would feel no challenge.1961, Kiplinger's Personal Finance, volume 15, number 12, page 34
A concealed electronic eavesdropping or intercept device
- We installed a bug in her telephone.
Synonyms:

wire
A small and usually invisible file (traditionally a single-pixel image) on a World Wide Web page, primarily used to track users.
- He suspected the image was a Web bug used for determining who was visiting the site.
A small, usually transparent or translucent image placed in a corner of a television program to identify the broadcasting network or cable channel.
- Channel 4's bug distracted Jim from his favorite show.
- The score bug displays the current football score over the ongoing match.
A manually positioned marker in flight instruments.
- You look up the proper speed for the phase of flight, set the reminder bug, and then literally forget the speed. You don't read the airspeed number, you fly to the bug.2004, Flying Magazine, volume 131, number 10, page 10
A semi-automated telegraph key.
- At this point your telegraph operator, sitting at your right, goes "Ticky-tick-tickety-de-tick-tick," with his bug, as he calls his transmitter, and looks at you expectantly.1938, Paul Gallico, Farewell to Sport, page 257
- As far as the dashes are concerned, the bug is the same in operation as any regular key would be if it were turned up on edge instead of sitting flat on the desk.1942, Arthur Reinhold Nilson, Radio Code Manual, page 134

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(obsolete) Hobgoblin, scarecrow; anything that terrifies.
- Sir, spare your threats: / The bug which you would fright me with I seek.c. 1610–1611 (date written), William Shakespeare, “The Winters Tale”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount...
- In old wives tales that in old time did live,
  To whose odde tales much credit men did give,
  Great store of goblins, fairies, bugs, nightmares,
  Urchins, and elves, to many a house repaires.1850, Thomas Keightley, The Fairy Mythology, London: H.G. Bohn, page 280
Synonyms:

bog, bogey, bogle, boggle, boggard, bugbear
(chiefly LGBTQ, often preceded by the) HIV.
- The arguably most debated bareback practice that came to attract attention early on (and still does) was that of "bug chasing," in which HIV-negative men (bug chasers) actively seek out sex with HIV-positive men (gift givers).2019, Tora Holmberg, Annika Jonsson, Fredrik Palm, Death Matters: Cultural Sociology of Mortal Life, Springer, →ISBN, page 130
A limited form of wild card in some variants of poker.
(US, dated, slang, oil industry) Synonym of oil bug.
- Now, only three years later, most of the major oil companies maintain staffs of these men who examine cores, classify the various types of "bugs," or foraminifera, and make charts showing the depths at which each of the hundreds of types is found.July 1933, Popular Science
Synonyms:

oil bug
(US, slang) An asterisk denoting an apprentice jockey's weight allowance.
- The "bugs" are the asterisks next to the apprentice's name. One bug is a five-pound allowance, two bugs equal seven pounds, and three bugs equal ten pounds.1999, Anita Scialli, Inside Track 1999, page 62
(US, broadly, slang) A young apprentice jockey.

Synonyms:

bug boy
Synonym of union bug.

Synonyms:

union bug
(slang) A small piece of metal used in a slot machine to block certain winning combinations.
- Because many illegal slot-machine operators here and abroad do not like to give the slot-machine player even one chance to hit the jackpot or the big bonus, they make use of a "bug." This is a small, flat half-circle of iron about an inch long, which looks something like a bug.1961, John Scarne, Complete Guide to Gambling, page 394
(slang) A metal clip attached to the underside of a table, etc. to hold hidden cards, as a form of cheating.
- Some clumsy or audacious sharpers will go so far as to hold out cards in their lap, or stick them in a "bug" under the table.1897, Robert Frederick Foster, Foster's Complete Hoyle, page 195
- Fargo had been in a saloon in Kansas when a man was caught using a bug. Made of steel and shaped like a money clip with two sharp ends, the bug was jammed under a table and held cards the bug's owner palmed until they were needed.2006, Jon Sharpe, The Trailsman #299: Dakota Danger

Verb

bug (third-person singular simple present bugs, present participle bugging, simple past and past participle bugged)

(informal, transitive) To annoy.
- Don’t bug me, I’m busy!
(informal, intransitive) To act suspiciously or irrationally, especially in a way that annoys others.
- I'm worried about Wallace. He's been buggin' all week.
(transitive) To install an electronic listening device or devices in.
- We need to know what’s going on. We’ll bug his house.
Synonyms:

wire
(intransitive) To bulge or protrude.
- I well remember the combination of excitement and apprehension with which I tentatively entered my first "rap." My eyes bugged open. There must have been 25 women in the room. I don't think I had ever seen so many lesbians all together in one place before.1979 April 28, Lois H. Johnson, “Ten Years of Boston DOB: A Personal Memoir”, in Gay Community News, page 8
(transitive) To represent (a value) using a bug on an instrument.
- You (or the autopilot) are still steering to the bugged heading […]1996 April 5, Tom Horne, “Engage FD, and follow the bars”, in AOPA Turbine Pilot

Proper noun capitalized: Bug

the Bug

An East European river which flows northwest 450 miles through Belarus, Poland and Ukraine into the Baltic Sea. (Western Bug).
A river in Ukraine (Southern Bug), flowing 530 miles to the Dnieper estuary.

Noun (2) capitalized: Bug

Bug (plural Bugs)

(US, slang) A Volkswagen Beetle car.

Synonyms:

Beetle

Noun (3) capitalized: Bug

Bug (plural Bugs)

(slang) A Bugatti car.

Adjective capitalized: BUG

BUG (not comparable)

(abbreviation, initialism) Initialism of bisexual until graduation.

bug meaning in Marathi, Tagalog, Arabic and Indonesian

bug in Marathi

a colloquial name for various arthropods and other similar creeping creatures: कीडा kīḍā
problem that needs fixing (especially in computing): बग bag
to annoy: पकवणे pakavṇe

bug in Tagalog

a colloquial name for various arthropods and other similar creeping creatures: gagapang

bug in Arabic

problem that needs fixing (especially in computing): خَطَأ ḵaṭaʔ

bug in Indonesian

a colloquial name for various arthropods and other similar creeping creatures: serangga
an insect of the order Hemiptera: kepik
problem that needs fixing (especially in computing): kekutu, kutu, bug

More languagesFewer languages

bug in Persian: ساس sâs, باگ bâg, اشکال eškâl
bug in Thai: แมลง má-lɛɛng, แมง mɛɛng, บั๊ก bák, จุดบกพร่อง jùt-bòk-prɔ̂ng
bug in Vietnamese: bọ, lỗi

Examples of bug in a sentence

This app has a bug: when you try to sort a large spreadsheet, it closes.
The only reason the VW bug has a solenoid is to prevent it from dieseling.
This app has a bug: when you try to sort a large spreadsheet, it shuts.

All 40 example sentences with bug

Synonyms of bug

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All synonyms of bug

Forms of bug

Noun
plural	bugs
plural	Bugs
alternative form (obsolete)	bugg
Verb
third-person singular present	bugs
present participle	bugging
past participle	bugged
past	bugged
Proper noun
alternative form	Buh

Past tense of bug: bugged

Plural of bug: bugs

Origin of bug

First attested in this form around 1620 (referring to a “bedbug”), from earlier bugge (“beetle”), from Middle English bugge (“scarecrow, hobgoblin”) which is traced alternatively to: * a Celtic root found in Scots bogill (“goblin, bugbear”) and obsolete Welsh bwg (“ghost, hobgoblin”); compare Welsh bwgwl (“threat, fear”) and Middle Irish bocanách (“supernatural being”). * Proto-Germanic *bugja- (“swollen up, thick”), from Proto-Indo-European *bʰew-, *bu- (“to swell”); compare Norwegian bugge (“big man”), dialectal Low German Bögge (“goblin, snot”). * or to a word related to buck and originally referring to a goat-shaped spectre. For the “insect” meaning the assonance with Middle English budde (“beetle”), from Old English budda, from Proto-West Germanic *buʀdō, from Proto-Germanic *buzdô, from the same ultimate source as above, might have played a role. Compare Low German Budde (“louse, grub”), Norwegian budda (“newborn domestic animal”), Icelandic budda (“purse”). More at bud. But ultimately this convergence of meaning doesn't prove a conflation of the two terms; they might have existed in parallel since PIE times with similar meanings, even if unnoticed by literary sources. The...

From the Slavic hydronym *bugъ /*buga.

Phrases with bug

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Words that rhyme with bug

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Questions about bug

What does bug mean?: Bug means an insect of the order Hemiptera (the “true bugs”).
What is bug in Marathi?: Bug in Marathi is कीडा (kīḍā), बग (bag), पकवणे (pakavṇe). See Bug meaning in Marathi.
What part of speech is bug?: Bug can be a noun, a verb, a proper noun or an adjective.
How do you pronounce bug?: Bug is pronounced /bʌɡ/ (UK).
What is the plural of bug?: The plural of bug is bugs.

Words near bug in the dictionary

Adapted from Wiktionary: bug (page history and authors); Bug (page history and authors); BUG (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated: 2026-09-02

Pronunciation audio from Wikimedia Commons, each file under its own free license: en-us-bug.ogg, En-au-Bug.ogg.

Cite this entry: “bug.” Word.ws, https://word.ws/bug. Based on Wiktionary, CC BY-SA 4.0.