∙ A sewing pin, sometimes called a ballhead pin, which is 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.
∙ A small nail with a head and a sharp point.
∙ A cylinder often of wood or metal used to fasten or as a bearing between two parts.
∙ The victory condition of holding the opponent's shoulders on the wrestling mat for a prescribed period of time. wrestling
∙ A slender object specially designed for use in a specific game or sport, such as skittles or bowling.
∙ (in pluralpins; informal) A leg.
∙ Any of the individual connecting elements of a multipole electrical connector. electricity
∙ A piece of jewellery that is attached to clothing with a pin.
∙ 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. US
∙ A scenario in which moving a lesser piece to escape from attack would expose a more valuable piece to attack. chess
∙ The spot at the exact centre of the house (the target area) curling
∙ A mood, a state of being. dated
∙ One of a row of pegs in the side of an ancient drinking cup to mark how much each person should drink.
∙ caligo medicine, obsolete
∙ A thing of small value; a trifle.
∙ A peg in musical instruments for increasing or relaxing the tension of the strings.
∙ A short shaft, sometimes forming a bolt, a part of which serves as a journal. engineering
∙ The tenon of a dovetail joint.
∙ A size of brewery cask, equal to half a firkin, or eighth of a barrel. Britain, brewing
Verb
∙ (often followed by a preposition such astooron) To fasten or attach (something) with a pin.
∙ To cause (a piece) to be in a pin. chess, usually passive
∙ To pin down (someone). wrestling
∙ To enclose; to confine; to pen; to pound.
∙ To attach (an icon, application, etc.) to another item. computing, graphical user interface