To extend by stretching
To close out a position, especially a complicated position.
To undo something.
To relax; to chill out; to rest and become relieved of stress
To be or become unwound; to be capable of being unwound or untwisted.
To analyse (a call stack) so as to generate a stack trace etc.
To separate (something that is wound up)
Any mechanism or operation that unwinds something.