(colloquial) To hurry up.

To leave a place, a meeting, etc., without being noticed; to slip away, slip off. / Used other than figuratively or idiomatically: see slide, off.

(law) A person or group of people given the responsibility of determining the facts of a case from evidence presented in a legal proceeding.

It is often wise to refrain from seemingly brave speech or action.

(mathematics) A collection of non-negative-valued functions defined on a topological space, such that every point has only finitely many nonzero values, and these sum to one.

(idiomatic) A person who participates in entertainment events in a very enthusiastic manner and who has a leading role in inspiring others to join in the spirit of festivity.

To avenge oneself.

Alternative spelling of off the books (preceding a noun only)

(slang) A drug addiction. / (slang) Withdrawal symptoms.

(idiomatic, euphemistic) Plain; unattractive.