To separate (something that is wound up)
Could you unwind about a foot of ribbon so I can finish the package?
To disentangle
To relax; to chill out; to rest and relieve of stress
After work, I like to unwind by smoking a pipe while reading the paper.
To be or become unwound; to be capable of being unwound or untwisted.
To undo something.
To analyse (a call stack) so as to generate a stack trace etc.