n A small device, made (usually) of drawn-out steel wire with one end sharpened and the other flattened or rounded into a head, used for fastening.
n A cylinder often of wood or metal used to fasten or as a bearing between two parts.
n A slender object specially designed for use in a specific game or sport, such as skittles or bowling.
n (in plural'pins'; informal) A leg.
n (electricity) Any of the individual connecting elements of a multipole electrical connector.
n A piece of jewellery that is attached to clothing with a pin.
n (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.
n (chess) A scenario in which moving a lesser piece which is under attack would expose a more valuable piece to attack.
n (curling) The spot at the exact centre of the house (the target area)