hallo

Interjection

1. (dated) A cry of surprise.
   • It sounds like a sum in the rule of three. The answer should give us the— But hallo! here are the accredited representatives of the law.1890 February, A[rthur] Conan Doyle, “Sherlock Holmes Gives a Demonstration”, in The Sign of Four (Standard Library), London: Spencer Blackett […], →OCLC, page 98

   Synonyms:

   wow

Noun

hallo (plural hallos or halloes)

1. The cry "hallo!"
2. A shout of exultation.

Verb

hallo (third-person singular simple present hallos or halloes, present participle halloing, simple past and past participle halloed)

1. (intransitive) To shout, or to call with a loud voice.
   • Tom was just hiding behind a wall, […] but the groom saw him, and halloed to him to know where Mr. Grimes, the chimney-sweep, lived.1863, Charles Kingsley, The Water Babies: A Fairy Tale for a Land Baby
2. (transitive) To chase while shouting "hallo!"
3. (transitive) To cry "hallo" (to someone).
4. (transitive) To shout (something).