Resembling or tasting of rum. / (UK, colloquial, dated) Peculiar; odd.

A rum-drinking alcoholic.

The hindquarters of a four-legged mammal, not including its legs / A cut of meat from the rump of an animal. / The buttocks. / A remnant, as in Rump Parliament.

(transitive) To turn one's back on, to show one's (clothed) backside to, as a sign of disrespect. / (somewhat vulgar, slang) To fuck. (Compare bum (verb).) / (UK, slang) To cheat.

(dated) An extra passenger seat or row of seats in an automobile, which typically folds away into a rear storage compartment. / (aviation, colloquial) A jump seat.

An informal sale of donated items, usually to fund the programs of a church or charity. / (archaic) A sale of unclaimed goods.

A low, heavy, continuous sound, such as that of thunder or a hungry stomach. / (slang) A street fight or brawl.

(intransitive) To make a low, heavy, continuous sound. / (transitive) To discover deceitful or underhanded behaviour. / (intransitive) To move while making a rumbling noise.

An onomatopoeia describing a rumbling noise

(American spelling) Alternative spelling of rumour has it.