To be about to become important or central.

present participle of wait up

simple past tense and past participle of wait up

(medicine) Watchful waiting.

(historical) A lady's female servant.

Alternative form of wait tables

(intransitive, idiomatic) To spend an especially lengthy period of time inactively, while expecting the arrival of someone or while anticipating some other event, often impatiently and often without a satisfactory outcome.

(law) the act of hiding and waiting for an individual with the intent to kill or inflict serious bodily harm to that person

(US, Canada) Alternative form of waitstaff.

(idiomatic) A strategy or course of action in which one or more parties refrain from direct action until circumstances change in their favor.