(idiomatic) In a precarious situation.

(idiomatic) Lacking reality and serviceability. / (idiomatic) Of a dream unlikely to ever come true; impractical, unrealizable.

(idiomatic) Something (especially a minor thing) which ruins or spoils everything else, or makes it less pleasant; a nuisance or problem; a disagreeable or unpleasant detail.

Teamwork should focus on the needs of the team, not on the individual.

Not able to be accessed; out of reach; inconvenient. / Not able to be reached; unattainable.

(mathematics) An uncountable regular cardinal number that is a limit cardinal.

(transitive) To let someone or something come in; to admit someone or something in. / To divulge one's inner thoughts to (someone), making oneself emotionally vulnerable to them; to open up to (someone).

To experience a certain “fluttery” physical sensation in a person's stomach, associated with nervousness, uncertainty, anxiety, or apprehension.

(somewhat dated) Very tired. / (chiefly UK) With everything included. / (poker) Having no further stake to wager, but remaining active in a hand.

(poker) A hand where at least one player bets all of his or her chips. / (poker) A player who is all in.