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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.
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A sliding pin or bar in a lock or latch mechanism.
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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.
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A sliding mechanism to chamber and unchamber a cartridge in a firearm.
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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.
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A lightning spark, i.e., a lightning bolt.
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A sudden event, action or emotion.
example
The problem's solution struck him like a bolt from the blue.
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A large roll of fabric or similar material, as a bolt of cloth.
example
24 March 1774 - Newspaper: Stamford Mercury - "Mr. Cole, Basket-maker...has lost near 300 boults of rods" https//www.britishnewspaperarchive.co.uk/viewer/bl/0000254/17740324/001/0001
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A sudden spring or start; a sudden leap aside.
example
The horse made a bolt.
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A sudden flight, as to escape creditors.
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A refusal to support a nomination made by the party with which one has been connected; a breaking away from one's party.
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An iron to fasten the legs of a prisoner; a shackle; a fetter.
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A burst of speed or efficiency.