(informal, Britain, Australia) Unacceptable or impossible.

(idiomatic) To refuse completely to do something, generally out of scorn.

(informal) To not know; to have no idea.

(idiomatic, litotes) Pretty good, imperfect but more than OK.

Why is that not true? / Used to state that one has no objection to and approves of a proposal. / Used to introduce a proposal.

(idiomatic) Very little; not a lot.

(idiomatic, figuratively, humorous) unsportsmanlike.

(intransitive) To be destitute or penniless.

(idiomatic) To remain in one's mind for a long duration.

(idiomatic) To be unable to say a single word because of someone else's talkativeness.