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Bolt

(1) A round iron or steel bar with a square (or later a hexagonal) head at one end and a screw thread at the other, to take a square (or later a hexagonal) internally-threaded nut. Used to hold or clamp two or more components together. (2) A sliding wooden or metal bar or rod, used to secure a door, shutter or other device. (3) The action of BOLTING. (to bolt).