Alternative form of birds and bees

(idiomatic) Under close scrutiny or examination.

(idiomatic) Old; aged.

(idiomatic, informal) Worthless; useless; pointless; not deserving serious consideration.

(intransitive, idiomatic) To formalize an agreement.

(idiomatic, UK) To introduce a problem, dilemma or obstacle, something unexpected or troublesome.

(idiomatic) To deal with a matter in a direct manner, especially to confront a difficulty rather than avoid it.

(idiomatic) A guess, attempt, or choice made with little or no evidence or knowledge.

(mathematics) The problem, proposed by ancient Greek geometers, of using a finite ruler-and-compass construction to make a square with the same area as a given circle.

(poker) To raise the stakes of a hand of poker / (dispute) To take an action that raises the stakes, i.e. that increases the chances of conflict. / (idiomatic) To make something more difficult.