To take in the slack of (a rope).
To reduce or diminish in amount, quantity, or extent; to lessen.
To reduce (sail) by taking it in.
To become shorter.
To make shorter; to abbreviate.
To make short or friable, as pastry, with butter, lard, etc.
To make deficient (as to); to deprive (of).
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.