Something potentially very dangerous or likely to fail.

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

(computing) Any of several instances in which a computer's processor cannot execute instructions (either for the entire computer, or just for a specific task) until an I/O operation completes, or until an interrupt is resolved

To stay awake waiting for somebody to return. / (colloquial, often used in the imperative, US) To wait.

(idiomatic) To eagerly anticipate; to find it hard to wait for a forthcoming pleasurable event. / To need to be attended to right away.

To wait as a server in a restaurant or other dine-in eatery.

To be hiding, waiting to ambush or attack someone, or simply to accost them unexpectedly.

plural of wait state

(South Africa) One of numerous acacias and mimosas and relatives. / Ziziphus mucronata (buffalo thorn, Cape thorn) / The grapple plant (Uncarina leptocarpa).

The common prickly ash (Zanthoxylum americanum). / The greenbrier (Smilax spp., esp. Smilax rotundifolia) / Any of various species of hawthorn (Crataegus crus-galli, etc.).