To become involved or associated with (especially a group of people)

In the general case; without further assumption; without qualification; in all respects. / As a rule; usually.

(chiefly UK) In a hospital as a patient.

(Canada, US, idiomatic) Admitted as a patient in a hospital.

(idiomatic) A persistent difficulty or something very annoying that will not go away.

Verbatim; using exactly the given words.

(idiomatic) Instantaneously; very quickly; in almost no time.

(games) A children's game in which two players keep an object away from a third player (who is in between them) by throwing it past that player.

(idiomatic) Immediately; instantaneously. / 2007 April 28, Hugh Muir, The Guardian:

Very probably; almost certainly.