up
1.
to increase the sound, heat, etc. of a piece of equipment :
Could you turn the TV up?
[+ adj ]
The music was turned up loud.
2.
( BrE ) to make a piece of clothing shorter by folding and sewing it up at the bottom
OPP let down
—related noun turn-up
3.
to find sth :
Our efforts to trace him turned up nothing.