colloquial. to know what's what: to have good judgement, know what is appropriate; to have full knowledge of a particular matter; (now esp.) to…

to know where to find a person and variants: to be able to make out a person's meaning or intentions. Similarly where may we find you?.

To come into the world, to be born; (hence) to be brought out or published; = to see the light of day at phrases 2c(b).

to be awake to (anything): to be fully conscious of it, to appreciate it fully. Cf. alive, adj. 4.

figurative. to know (also be up to,etc.) a move or two: to be cunning, shrewd, sharp; to have experience of the world. Also to be up to every move on…

intransitive. colloquial (originally U.S.). To grasp the meaning, truth or significance of; to understand; to detect or discover.

colloquial (originally and chiefly Australian and New Zealand). to get the strength of: to understand the character, state, significance, or…

colloquial (originally U.S.). to be (or get) wise to, to be (or become) aware of; to put (one) wise (to), to inform one (of), enlighten one…

colloquial. in the picture: involved in or fully aware of a particular situation or activity; in harmony with one's surroundings; present; out of t…

the penny dropped and variants: a situation or statement has at last been understood; a person has reacted belatedly.

transitive. intransitive. colloquial (originally U.S.). With on. To understand or appreciate; to realize or become aware of; to notice.

colloquial. to get the message: to understand a position stated or implied.

to take on board (figurative), to drink or consume; to swallow; also, to accept (an idea, etc.), to grasp.