turn up

(verb): To show up; to appear suddenly or unexpectedly.
(verb): To cause to appear; to find by searching, etc.
(verb): To increase the amount of something by means of a control, such as the volume, heat, or light.
(verb): To reposition by rotating, flipping, etc. upwards.
(verb): To belay or make fast a line on a cleat or pin.
(verb): To party hard, especially when involving alcohol or drugs.
(noun): Fabric turned up at the bottom of trousers to make them shorter.
(noun): A fight or disturbance.
(noun): The next card taken from the top of a pack of cards and displayed.
(noun): A stroke of good luck; something that appears unexpectedly; especially in turn up for the book.

I don't like people turning up without an appointment.
I spent hours in the archives, but couldn't turn up anything on the alleged criminal.
Turn up the radio and sing along.
He turned up his collar against the cold.
Turn up the main halyard.