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English definition of “bum”

bum

noun [C] uk   /bʌm/ us  

bum noun [C] (BODY PART)

mainly UK informal the part of the body that you sit on
Synonym

bum noun [C] (PERSON)

US informal someone who has no home or job and lives by asking other people for money

bum

adjective [before noun] uk   /bʌm/ slang us  
bad in quality or not useful: He gave us bum directions, but we eventually found the place.

bum

verb [T] uk   /bʌm/ (-mm-) slang us  
to ask someone for something without intending to pay for it: Could I bum a cigarette off you?
(Definition of bum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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