To arrive or appear at a place, especially unexpectedly or after being absent. She was worried when her cat didn't turn up for dinner.
To increase the volume, temperature, or intensity of something. Can you turn up the music? I can't hear it.
To be found, especially by chance, after being lost. The missing keys finally turned up in the couch cushions.
To happen or occur, especially unexpectedly. An opportunity to travel to Europe turned up, so I took it.