(idiomatic) To procrastinate, put off; to dawdle, avoid, or make progress slowly and reluctantly. / (idiomatic) To intentionally stall, to delay, to obstruct.

(idiomatic) More complex or confusing than one can understand; beyond one’s comprehension. / (idiomatic) More than one can handle; too much (especially in over one's head).

(idiomatic) To feel energetic or frisky; to behave in a vigorous or bold manner. / (idiomatic) To feel important; to be empowered.

(idiomatic, chiefly in the negative) To identify, specify, name or pick out.

Known but not quite remembered.

(idiomatic) To refrain from talking about something.

(card games) In card playing, to accidentally reveal one's cards or hand. / (figuratively) To inadvertently reveal any secret, particularly a secret that puts one at an advantage or disadvantage.

To behave in a manner appropriate to one's age. / (imperative, originally US) To behave in a mature manner; to avoid being childish.

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

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