(idiomatic) barely; closely; by a narrow margin; with nothing to spare.

(idiomatic) To make no progress despite making an effort; to get nowhere.

(idiomatic) The limit of one’s patience, when one is so frustrated or annoyed that one can no longer cope. / (idiomatic) The point at which one has run out of options or the ability to delay.

(travel) A ticket granting permission to travel to a place but not return. / (figuratively) A course of action from which there is no return.

(chiefly Britain, dated in US, idiomatic) Insane, crazy.

(idiomatic) Superlative; impossible to beat.

(idiomatic) That said to be possessed by someone who is obsessed with something or only able to think of one thing.

(idiomatic) To be alone and self-absorbed in an uncomfortable state of mind, especially while experiencing the unpleasant effects of one's own actions.

(idiomatic) To reconsider; rethink; to reach a different conclusion. / (idiomatic) To change one's story.

(idiomatic) To decide differently than one had decided before.