To turn a vehicle in a semicircle so as to face the opposite direction. / (intransitive) To shift from one opinion or decision to its opposite.

(idiomatic) A good deed; a thoughtful or selfless act.

(transitive, idiomatic) To rebel or oppose to something formerly supported. / (transitive, intransitive) To set against or in opposition to something.

Used other than figuratively or idiomatically: see turn, over. / To flip over; to rotate uppermost to bottom. / (transitive, idiomatic) To relinquish; give back. / (transitive, idiomatic) To transfer.

(intransitive, copulative) To show up; to appear suddenly or unexpectedly. / (transitive) To cause to appear; to find by searching, etc.

Alternative spelling of turn-up

(transitive, obsolete) To dismiss; to fire. / (transitive) To power down, to switch off, to put out of operation, to deactivate (an appliance, light, mechanism, functionality etc.).

(intransitive, idiomatic, copulative) To end up; to result. / (intransitive, by ellipsis) To succeed; work out; turn out well. / (intransitive, idiomatic) To attend; show up.

(idiomatic) To refuse, decline, or deny. / (idiomatic) To reduce the power, etc. of something by means of a control, such as the volume, heat, or light.

(colloquial, US) A rapid illegal U-turn performed by putting the car in neutral and applying the hand brake, thereby producing a controlled skid, with the car still moving backwards when forward power is again applied.