The hub of a propeller / The central part of a propeller, into which the blades fit

(idiomatic) To rapidly reach a turning point or climax. / (idiomatic) To suddenly reveal that which has lain latent for a time.

The highest ranking coach of a coaching staff.

That part of a printer that transfers a character or image to the paper.

The chief, senior or most authoritative of a group of linesmen officiating at a match.

(figuratively, usually with have or with) Used to indicate that a person is distracted or disconnected from the present situation.

Alternative spelling of hardheaded

Alternative spelling of headhunter

(idiomatic, chiefly Scotland, Ireland, Liverpudlian, slang) a stupid person; a nutcase

(two-up) A crooked organiser of a two-up game, who would cheat players out of their money.