(idiomatic) To be experienced or well-informed. / (idiomatic) To be astute, perceptive enough to observe a situation that is not what it seems and recognize its true nature.

Alternative form of know inside and out

(transitive, simile) To have an extensive and penetrating understanding of (something or someone).

Alternative form of God knows, in sense of something unknown to mortal men.

Alternative form of God knows, in sense of something unknown to mortal men.

To be spoiled; to have an easy life without appreciating it.

Synonym of God knows

Possibly or conceivably, given one's limited knowledge.

(idiomatic, vulgar) Synonym of I don't know

(idiomatic, vulgar) To be well-informed concerning a particular subject; to have a capable command of a particular area of expertise.