English definition of “screw”
screw sth down/to/onto, etc › to fasten something with a screw: You need to screw the cabinet to the wall.
screw sth on/down/together, etc › to fasten something by turning it round until it is tight, or to be fastened this way: The lid is screwed on so tight I can't get it off. → Opposite unscrew
screw up your eyes/face › to move the muscles of your face so that your eyes become narrow: He screwed up his eyes in the bright sunlight.