(informal) The person in charge; the highest-ranking person in an organization.

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

A screwdriver with a '+' shaped head for turning screws so socketed. / A screw turned by such a screwdriver.

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

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

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

A knot, or any of various similar kinds of knot, resulting in a ball of rope. / (Caribbean) The melon cactus. / (California) Any of several species of Echinocactus.

(intransitive) To begin moving away. / (transitive) To intercept. / (transitive) To avoid the undesirable consequences of; prevent. / (intransitive) To start out. / (nautical) To turn away from the wind.

(idiomatic) Entirely; completely; over one's full body. / In reversed positions; in a lying position of two people where each person's feet are juxtaposed with the other person's head.

The highest ranking coach of a coaching staff.