What is the meaning of Unfold?

To undo a folding.

To become unfolded.

To turn out; to happen; to develop.

To lay open to view or contemplation; to bring out in all the details, or by successive development; to reveal.

To release from a fold or pen.

To reassemble a line of text that was split across multiple lines.

In functional programming, a kind of higher-order function that is the opposite of a fold.

Source: wiktionary.org