screwback

noun

1. The period of screw rotation during injection molding when the plastic can flow into the mold.
2. A hook-shapped attachment for an earring that sits behind the earlobe and tightens with a screw. Also, an earring that uses this type of attachment.
3. A mechanism for attaching a small item to clothing that operates by a post which goes through the cloth and a small backing plate that screws to the post. Also, the medal, tie pin, button, etc. that uses this type of attachment.
4. A type of case for a pocket watch where the mechanism is accessed by a removable back plate that screws onto the back of the case. Also, a watch that has such a case.
5. The effect of putting backspin on the cue ball.
6. A powerful shot that imparts a spin to the ball.
7. A half-volley executed by holding the racket loosely and swinging it straight at the ball.
8. A masonry abutment on an arch that is wedge-shaped in order to transmit the thrust downward.
9. An industrial digging machine that uses a large screw at the back to drill into the ground.
10. A type of propeller in which the blades are angled to produce a motion similar to threading a screw. Also, the angle of the blades on such a propeller.
11. A tightening screw on the back of a hand tool.