(chiefly Britain, dated in US, idiomatic) Insane, crazy.

(idiomatic) A problem that is challenging to solve. / (idiomatic, by extension) A situation, person, group, etc. which is difficult to deal with.

A cylindrical push-and-twist connector for thin coaxial cable.

(US) From the first course of a meal to the last. / (idiomatic, US) From beginning to end; throughout.

Time to gather nuts before they are taken by other animals or buried in snow. / (idiomatic) Time to exert maximum effort, for example, due to an approaching deadline or a looming competitive situation.

(intransitive, slang) To become stridently angry, especially from worry.

brown butter

Indicates that the speaker has an allergy to nuts.

plural of barrel nut connector

Used other than figuratively or idiomatically: see hard, nut, crack. / (idiomatic) A problem that is challenging to solve.