To remove or clear a block or obstruction from.
In whist, to throw away a high card so as not to interrupt one's partner's long suit.
To free or make available.
To enable communication again, via telephone, instant messaging, etc., with (somebody previously blocked).
The removal of a block or blockage.
To undo something.
To relax; to chill out; to rest and become relieved of stress
To close out a position, especially a complicated position.
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.