To undo a folding.
to unfold a map; to unfold a tablecloth; She unpacks the new dress and unfolds it carefully.
To become unfolded.
The curtains unfolded to reveal the stage.
To release from a fold or pen.
to unfold sheep
In functional programming, a kind of higher-order function that is the opposite of a fold.
From Middle English unfolden, from Old English unfealdan (“to unfold”), equivalent to un- + fold.
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