back-door

Noun

back door (countable and uncountable, plural back doors)

1. A subsidiary entrance to a building or house at its rear, normally away from the street.
   • "Charles II, who was crowned here a little while before, occupied an old house (which is still standing) in New Street [Worcester], from which he escaped by the back door, as the enemy rushed in at the front."2023 January 11, Stephen Roberts, “Bradshaw's Britain: castles and cathedrals”, in RAIL, number 974, page 57
2. A means of access, often secret and unprotected, to something.
   • Scoring three goals at home should guarantee you three points, but when you go on the attack a little bit more, you leave the back door open. That's not always a good idea with this team.2021 November 29, Alan Shearer, “Why Newcastle have to win their next two games to give them hope of staying in the Premier League - Alan Shearer analysis”, in BBC Sport
3. (computer security) A secret means of access to a program or system.
4. A rear side door of a car, or at the back of a van.
5. (slang) The anus (usually in sexual practices).
   • backdoor action

   Synonyms:

   backgate

6. (broadly, slang, uncountable) Anal sex.
   • Oh, don't be so judgmental. You could use a little back door.1998 June 28, Michael Patrick King, “Valley of the Twenty-Something Guys”, in Sex and the City, season 1, episode 4, spoken by Samantha

See all 14 meanings of back door