The verb to wind

The verb wind (said /waɪnd/: to wrap something around something) has the Past Simple wound (said /waʊnd/). The past participle is also wound. Wind → wound → wound. It works like find → found and bind → bound.

It depends on the meaning. Wind /wɪnd/ is a noun: moving air. The wind blew all night. Wind /waɪnd/ is a verb: to wrap something, or to turn a small key to make a clock or a watch work. I wind my watch every morning. Same spelling, different sound and meaning: words like this are called homographs.

Both, with two different sounds. Wound /waʊnd/ is the past of the verb wind: She wound the rope around the tree. Wound /wuːnd/ is a noun that means an injury, like a deep cut: He has a wound on his arm. The context tells you which one it is.

Wind up has several meanings. (1) To turn a key to make something work: wind up a watch. (2) To end up somewhere, often without a plan: We wound up at a Mexican restaurant. (3) In informal British English, to tease or annoy someone: Stop winding me up! (4) To finish something: Let's wind up the meeting.

Wind down has three meanings. (1) To relax after work or school: I need to wind down. (2) To open a car window by turning a handle (mostly British English; American English says roll down the window). (3) To become less active, little by little: The business is winding down.