pin

1. A needle without an eye (usually) made of drawn-out steel wire with one end sharpened and the other flattened or rounded into a head, used for fastening.
2. A small nail with a head and a sharp point.
3. A cylinder often of wood or metal used to fasten or as a bearing between two parts.

   Pull the pin out of the grenade before throwing it at the enemy.

4. The victory condition of holding the opponent's shoulders on the wrestling mat for a prescribed period of time.
5. A slender object specially designed for use in a specific game or sport, such as skittles or bowling.
6. (in plural) A leg.

   I'm not so good on my pins these days.

7. Any of the individual connecting elements of a multipole electrical connector.

   The UK standard connector for domestic mains electricity has three pins.

8. A piece of jewellery that is attached to clothing with a pin.
9. A simple accessory that can be attached to clothing with a pin or fastener, often round and bearing a design, logo or message, and used for decoration, identification or to show political affiliation, etc.
10. A scenario in which moving a lesser piece to escape from attack would expose a more valuable piece to attack.
11. The flagstick: the flag-bearing pole which marks the location of a hole
12. The spot at the exact centre of the house (the target area)

    The shot landed right on the pin.

13. A mood, a state of being.
14. One of a row of pegs in the side of an ancient drinking cup to mark how much each person should drink.
15. Caligo.
16. A thing of small value; a trifle.
17. A peg in musical instruments for increasing or relaxing the tension of the strings.
18. A short shaft, sometimes forming a bolt, a part of which serves as a journal.
19. The tenon of a dovetail joint.
20. A size of brewery cask, equal to half a firkin, or eighth of a barrel.
21. A pinball machine.

    I spent most of my time in the arcade playing pins.

1. (often followed by a preposition such as "to" or "on") To fasten or attach (something) with a pin.
2. (usually in the passive) To cause (a piece) to be in a pin.
3. To pin down (someone).
4. To enclose; to confine; to pen; to pound.
5. To attach (an icon, application, etc.) to another item.

   to pin a window to the Taskbar

6. To fix (an array in memory, a security certificate, etc.) so that it cannot be modified.

   When marshaling data, the interop marshaler can copy or pin the data being marshaled.

7. To cause an analog gauge to reach the stop pin at the high end of the range.

verb

To shape metal by striking it, especially with a peen.