bolt in Chinese

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 lightning spark, i.e., a lightning bolt.

(intransitive) To flee, to depart, to accelerate away suddenly.