English Reference
noun · verb · adjective

bum

n. · v. · adj.
US /ˈbəm/ UK /bˈʌm/ bum UK spelling bum's, bum's, bummed, bumming

  1. 01 B1 Intermediate British EnglishInformal

    n.the part of your body that you sit on.

    n.the buttocks. This usage is common in British and Commonwealth English but is considered childish or mildly impolite rather than truly vulgar.

    Simple

    The toddler fell down right on his bum but didn't cry.

    In context

    He spent the entire Sunday afternoon sitting on his bum watching cricket, much to the annoyance of his partner who wanted to go for a walk.

    Teacher's tip

    In British English, this is the standard informal word for 'bottom'. In American English, 'butt' is much more common for this meaning.

  2. 02 B2 Upper Intermediate American EnglishInformal

    n.a person who has no home or job, or someone who is very lazy.

    n.a person who avoids work and lives on others; also used to describe a person experiencing homelessness.

    Simple

    He's been a total bum since he lost his job and won't even look for a new one.

    In context

    The local residents complained about the bums sleeping in the park, though the city lacked sufficient shelter space to house them.

    Teacher's tip

    This can be quite derogatory. Use with caution when referring to people in difficult social situations.

  3. 03 B2 Upper Intermediate InformalSlang

    v.to ask someone to give you something for free, like a cigarette or a lift.

    v.to obtain something by begging or borrowing without the intent of returning it. Often used with 'off' or 'from'.

    Simple

    Can I bum a cigarette off you?

    In context

    He managed to bum a ride to the coast with some students who were heading that way for the weekend.

    moochcadgescrounge
  4. 04 B2 Upper Intermediate InformalSlang

    v.to make someone feel sad or disappointed.

    v.to depress or dispirit someone. Almost always used in the phrasal form 'bum out'.

    Simple

    It really bums me out that we can't go to the concert tonight.

    In context

    The news about the budget cuts really bummed the whole team out, especially after they had worked so hard on the project.

    depresssaddenupset
  5. 05 C1 Advanced InformalSlang

    adj.of poor quality, or not working correctly.

    adj.of poor quality, useless, or physically defective (such as an injury).

    Simple

    I can't go hiking because I have a bum knee.

    In context

    The mechanic told me the car was a total loss because of a bum engine that would cost more to fix than the vehicle was worth.

His end product needs work, but he will get bums off seats.

The Guardian· 6 Aug 2026
This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated