To undo a folding.
To release from a fold or pen.
To turn out; to happen; to develop.
To open (anything covered or closed); to lay open to view or contemplation; to bring out in all the details, or by successive development.
To reveal.
In functional programming, a kind of higher-order function that is the opposite of a fold.
To become undone; to collapse.
To separate the threads (of); disentangle.
To become separated; (of something woven, knitted, etc.) to come apart.
To separate the connected or united parts of; to throw into disorder; to confuse.
To clear from complication or difficulty; to unfold; to solve.