Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: Probably from bummer 'bum' (19-20 centuries), perhaps from German bummler 'lazy person'

bum

1 noun
     
bum1 S3 [countable] informal
1 British English the part of your body that you sit on [= bottom]
2 American English someone, especially a man, who has no home or job, and who asks people for money
3

beach/ski etc bum

someone who spends all their time on the beach skiing etc without having a job
4 someone who is very lazy
5

get/put bums on seats

British English informal to make a large number of people go to see a film, play, sports match etc:
She's the kind of star who will put bums on seats.

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