• To peen. • To inclose; to confine; to pen; to pound. • A piece of wood, metal, etc., generally cylindrical, used for fastening separate articles together, or as a support by which one article may be suspended from another; a peg; a bolt. • Especially, a small, pointed and headed piece of brass or other wire (commonly tinned), largely used for fastening clothes, attaching papers, etc. • Hence, a thing of small value; a trifle. • That which resembles a pin in its form or use • A peg in musical instruments, for increasing or relaxing the tension of the strings. • A linchpin. • A rolling-pin. • A clothespin. • A short shaft, sometimes forming a bolt, a part of which serves as a journal. • The tenon of a dovetail joint. • One of a row of pegs in the side of an ancient drinking cup to mark how much each man should drink. • The bull's eye, or center, of a target; hence, the center. • Mood; humor. • Caligo. See Caligo. • An ornament, as a brooch or badge, fastened to the clothing by a pin; as, a Masonic pin. • The leg; as, to knock one off his pins. • To fasten with, or as with, a pin; to join; as, to pin a garment; to pin boards together.