(transitive) To form a pile, stack, or heap. / (idiomatic, intransitive) To collect or accumulate, as a backlog.

(transitive, of a numerical amount) To take the sum of; to total. / (intransitive) To accumulate; to amount to. / (idiomatic, intransitive) To make sense; to be reasonable or consistent.

A pile of crashed vehicles due to a traffic accident. / (American football) A pile of tackling players. / An accumulation that occurs over time, especially one which is not welcome.

(idiomatic) someone who is up-and-coming, who has begun to be successful in some field and is likely to become even more successful in the future

Alternative spelling of belly up

(intransitive) To put on special or fancy clothes. / (intransitive, often with 'as') To put on a costume portraying oneself as a particular type of character or well-known person.

(idiomatic) Dead or defunct.

(idiomatic) To gather close, or approach eagerly or assertively, as a bar for ordering alcoholic drinks.

(idiomatic) To talk more loudly or plainly. / (idiomatic) To make oneself or one's opinions known; to advocate or assert oneself.

(idiomatic, transitive) To grope someone, especially someone's breasts, in a sexual manner.