plural of waiting staff

(UK) Collectively, staff employed to wait at tables in a restaurant.

(colloquial) Bound to happen; absolutely to happen in the future.

(idiomatic) A thing or situation which is almost certain to eventually lead to an accident

plural of accident waiting to happen

(idiomatic, rare) To wait in expectation of an occurrence.

plural of disaster waiting to happen

Something potentially very dangerous or likely to fail.

(rhetorical question) What is the delay? Why are you not acting or proceeding?

Indicates that something unpleasant is going to happen to the interlocutor, and the speaker is glad about it, as in vengeance or punishment.