(firearms) the part of the firing mechanism which strikes the cartridge's primer to ignite the gunpowder.

(nautical) A device like a belaying pin but of heavier scantlings; a turned length of wood or metal passed through the bitts or cross-piece, used to prevent the cable from slipping off or over the bitt-heads yet removable so as to facilitate doing so.

(transitive) To put (e.g. a sheet of paper) on display, using a pin.

Alternative form of pin money

(historical) An allowance of money given by a man to his wife or to other dependents for their personal, discretionary use.

(transitive) To keep at a distance

A very thin short nail used in furniture.

(botany) Having the stigma visible at the throat of a gamopetalous corolla, while the stamens are concealed in the tube.

(US) A type of double-pronged hairpin.

(often attributive) A leather made from the skin of a young seal.