bum2

 
Pronunciation: /bʌm/

noun

British informal
  • a person’s buttocks or anus: if you sit there you’ll get a cold bum

Phrases

bums on seats

the audience at a theatre, cinema, or other entertainment, viewed as a source of income: I’ve been offered lots of films just because the producers thought I would put bums on seats

Origin:

late Middle English: of unknown origin