(idiomatic) born rich, or into a wealthy family

(idiomatic) To show oneself in the best or most positive way possible; to make a favorable impression.

(computing, slang) To use products or services one is selling internally, in order to understand their limitations.

(slang) Not mentally sound; insane. / (idiomatic) Stupid.

(idiomatic) To misstep or err.

(idiomatic) To solve two problems with one single action.

(archaic, idiomatic, rare) An incapable (sick, etc) or incompetent soldier.

Alternative form of burn the candle at both ends

(idiomatic) To express one's opinion strongly; to voice one's disagreement or dissatisfaction, especially with another person; to scold or rebuke someone.

(transitive, simile) To be intimately knowledgeable about something.