A screw is a metal object similar to a nail , with a raised spiral line around it. You turn a screw using a screwdriver so that it goes through two things, for example two pieces of wood , and fastens them together.
screw-back
a device used for fastening materials together, consisting of a threaded and usually tapered shank that has a slotted head by which it may be rotated so as to cut its own thread as it bores through the material
screw-bolt
a device used for fastening materials together, consisting of a threaded and usually tapered shank that has a slotted head by which it may be rotated so as to cut its own thread as it bores through the material
screwed up
If you say that someone is screwed up , you mean that they are very confused or worried, or that they have psychological problems.
screw up
If you screw up your eyes or your face , you tighten your eye or face muscles , for example because you are in pain or because the light is too bright .
have one's head screwed on
to be wise or sensible
have your head screwed on
to be sensible and realistic
screw tap
a valve by which a fluid flow from a pipe can be controlled by opening and closing an orifice
tap
A tap is a device that controls the flow of a liquid or gas from a pipe or container , for example on a sink .
tapped
to strike (something) lightly and usually repeatedly