Definitions from Wiktionary ( )

▸ noun:  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.
▸ noun:  A small nail with a head and a sharp point.
▸ noun:  A cylinder often of wood or metal used to fasten or as a bearing between two parts.
▸ noun:  (wrestling, professional wrestling) The victory condition of holding the opponent's shoulders on the wrestling mat for a prescribed period of time.
▸ noun:  A slender object specially designed for use in a specific game or sport, such as skittles or bowling.
▸ noun:  (informal, in the plural) A leg.
▸ noun:  (electricity) Any of the individual connecting elements of a multipole electrical connector.
▸ noun:  A piece of jewellery that is attached to clothing with a pin.
▸ noun:  (US) 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.
▸ noun:  (chess) Either a scenario in which moving a lesser piece to escape from attack would expose a more valuable piece to being taken instead, or one where moving a piece is impossible as it would place the king in check.
▸ noun:  (golf) The flagstick: the flag-bearing pole which marks the location of a hole
▸ noun:  (curling) The spot at the exact centre of the house (the target area)
▸ noun:  (archery) The spot at the exact centre of the target, originally a literal pin that fastened the target in place.
▸ noun:  (obsolete) A mood, a state of being.
▸ noun:  One of a row of pegs in the side of an ancient drinking cup to mark how much each person should drink.
▸ noun:  (medicine, obsolete) Caligo.
▸ noun:  A thing of small value; a trifle.
▸ noun:  A peg in musical instruments for increasing or relaxing the tension of the strings.
▸ noun:  (engineering) A short shaft, sometimes forming a bolt, a part of which serves as a journal.
▸ noun:  The tenon of a dovetail joint.
▸ noun:  (UK, brewing) A size of brewery cask, equal to half a firkin, or eighth of a barrel.
▸ noun:  (informal) A pinball machine.
▸ noun:  (locksmithing) A small cylindrical object which blocks the rotation of a pin-tumbler lock when the incorrect key is inserted.
▸ noun:  (bodybuilding, slang) An injection of PEDs.
▸ verb:  (often followed by a preposition such as "to" or "on") To fasten or attach (something) with a pin.
▸ verb:  (chess, usually passive voice) To cause (a piece) to be in a pin.
▸ verb:  (wrestling) To pin down (someone).
▸ verb:  To enclose; to confine; to pen; to pound.
▸ verb:  (computing, graphical user interface, transitive) To attach (an icon, application, message etc.) to another item so that it persists.
▸ verb:  (programming, transitive) To fix (an array in memory, a security certificate, etc.) so that it cannot be modified.
▸ verb:  (transitive) To cause an analog gauge to reach the stop pin at the high end of the range.
▸ verb:  (bodybuilding, slang, transitive, intransitive) To inject for performance enhancement.
▸ verb:  Alternative form of peen [To shape metal by striking it, especially with a peen.]
▸ noun:  Acronym of personal identification number. [A number used to confirm an individual's identity, e.g. when using an ATM or a mobile phone, or when making payment using a credit card or debit card.]
▸ noun:  (organic chemistry) Initialism of preferred IUPAC name.

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