Definitions
1.verbTo tighten or secure with screws.
2.verbTo raise (rent, fees, etc.) to extortionate levels.
3.verbTo raise or summon up."trying to screw up enough courage to ask her out"
4.verbTo twist into a contorted state."The baby screwed up his face and began to bawl."
5.verbTo squint.
6.verbTo make a mess of; to ruin.
7.verbTo blunder; to make a mistake.