Without prior consideration; spontaneously, impulsively

(colloquial) An exclamation of praise or encouragement.

(transitive) To be treacherous or faithless to; betray. / (transitive) To fail to keep; to renege on. / Used other than figuratively or idiomatically: see go back, on.

(of a garment) Designed to be worn with comfort by people with a wide range of sizes. / (figuratively, often derogatory) Suitable for a wide range of tastes, opinions, situations, etc.

Likely to happen only once in one's lifetime.

To use one's tongue to remove moistness from the sides of one's mouth, as when salivating or at the conclusion of a meal. / (idiomatic) To look forward avidly to eating something.

(intransitive) To realize; come to understand.

(idiomatic, humorous, informal) Synonym of get one's knickers in a twist

A form of challenge, in the same spirit as a medieval knight throwing down his gauntlet.

(idiomatic) The situation in reality as opposed to in the abstract. / (literally) Some aspects of the situation in a particular location.