a fastening bolt with nut



  • A (usually) metal fastener consisting of a cylindrical body that is threaded, with a larger head on one end. It can be inserted into an unthreaded hole up to the head, with a nut then threaded on the other end; a heavy machine screw.
  • A sliding pin or bar in a lock or latch mechanism.
  • A bar of wood or metal dropped in horizontal hooks on a door and adjoining wall or between the two sides of a double door, to prevent the door(s) from being forced open.
  • A sliding mechanism to chamber and unchamber a cartridge in a firearm.
  • A small personal-armour-piercing missile for short-range use, or (in common usage though deprecated by experts) a short arrow, intended to be shot from a crossbow or a catapult.
  • A lightning spark, i.e., a lightning bolt.
  • A sudden event, action or emotion.
  • A large roll of fabric or similar material, as a bolt of cloth.
  • A sudden spring or start; a sudden leap aside.
  • A sudden flight, as to escape creditors.
  • A refusal to support a nomination made by the party with which one has been connected; a breaking away from one's party.
  • An iron to fasten the legs of a prisoner; a shackle; a fetter.
  • A burst of speed or efficiency.
  • A stalk or scape (of garlic, onion, etc).
  • A sieve, especially a long fine sieve used in milling for bolting flour and meal; a bolter.



  • Suddenly; straight; unbendingly.


  • From Middle English bolt, from Old English bolt, from Proto-Germanic *bultaz, perhaps from Proto-Indo-European *bʰeld- ("to knock, strike"). Compare Lithuanian beldu ("I knock"), baldas. Akin to Dutch and West Frisian bout, German Bolz or Bolzen, Danish bolt, Swedish bult, Icelandic bolti.
  • From Middle English bulten, from Anglo-Norman buleter, Old French bulter (modern French bluter), from a Germanic source originally meaning "bag, pouch" cognate with Middle High German biuteln ("to sift"), from Proto-Germanic *buzdô ("beetle, grub, swelling"), from Proto-Indo-European *bʰūs- ("to move quickly"). Cognate with Dutch buidel.

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