Someone or something that bumps.

(colloquial, now chiefly attributive) Anything large or successful.

(automotive) Parts at the front and back of a vehicle which are meant to absorb the impact of a collision; fender.

Any mechanical device used to absorb an impact, soften a collision, or protect against impact.

(cricket) A bouncer.

(billiards) A side wall of a pool table.

A cylindrical object used (as a substitute for birds) to train dogs to retrieve.

(broadcasting) A short ditty or jingle used to separate a show from the advertisements.

(slang, Caribbean, Jamaica) A woman's posterior, particularly one that is considered full and desirable.

(music) An extra musician (not notated in the score) who assists the principal French horn by playing less-exposed passages, so that the principal can save their 'lip' for difficult solos. Also applied to other sections of the orchestra.

(pinball) An object on a playfield that applies force to the pinball when hit, often giving a minor increase in score.

(Australia, slang) A cigarette butt.

(horse racing) In National Hunt racing, a flat race for horses that have not yet competed either in flat racing or over obstacles.

(colloquial) Large; (as if) filled to the bumpers at the top of a silo.