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1. A tacklike pin with a large head that is easily inserted into a wall or board.
2. Archaic A children's game in which one player tries to push a pin over an opponent's pin.
(Tools) US and Canadian a pin with a small ball-shaped head
1. a short pin with a spool-shaped head of plastic, glass, or metal, used for affixing material to a bulletin board, wall, or the like.
2. Archaic. child's play; triviality.
[1665–75; earlier, a children's game played with pins]