What is the meaning of Wind-up?

The end or conclusion of something.

The punch line of a joke or comedy routine.

A humorous attempt to fool somebody; a practical joke in which the victim is encouraged to believe something untrue.

The phase of making a pitch where the pitcher moves his or her arm backwards before throwing the ball.

A circular hand gesture, supposed to represent the winding on of film, used to signal to a performer to finish quickly.

Needing to be wound up in order to function.

Source: wiktionary.org