N-COUNT 屁股；臀部 Someone's bum is the part of their body which they sit on.

N-COUNT 乞丐；无业游民 A bum is a person who has no permanent home or job and who gets money by working occasionally or by asking people for money.

N-COUNT 无赖；废物；瘪三 If someone refers to another person as a bum, they think that person is worthless or irresponsible.

ADJ 糟糕的；令人不快的 Some people use bum to describe a situation that they find unpleasant or annoying.

VERB 讨要；提出要 If you bum something off someone, you ask them for it and they give it to you.

VERB 闲逛；游荡 If you bum around, you go from place to place without any particular destination, either for enjoyment or because you have nothing else to do.

PHRASE 招揽观众 If the organizers of an event such as a concert want to put bums on seats, they want a lot of people to attend it.