°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.
°A small nail with a head and a sharp point.
°(often followed by a preposition such as to or on) To fasten or attach (something) with a pin.
°To cause (a piece) to be in a pin.
synonyms: nail, tack, peg, skittle more» , brooch, badge