Definitions of screw:

noun: a fastener with a tapered threaded shank and a slotted head
noun: a propeller with several angled blades that rotates to push against water or air
noun: a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole
noun: slang terms for sexual intercourse
noun: someone who guards prisoners
verb: tighten or fasten by means of screwing motions
Example: "Screw the bottle cap on"
verb: cause to penetrate, as with a circular motion
Example: "Drive in screws or bolts"
verb: turn like a screw
verb: have sexual intercourse with
verb: defeat someone in an expectation through trickery or deceit