Unfold
来自Big Physics
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Old English unfealdan (see un-2, fold1).
wiktionary
From Middle English unfolden, from Old English unfealdan(“to unfold”), equivalent to un- + fold.
etymonline
unfold (v.)
Old English unfealdan, "to open or unwrap the folds of," also figuratively, "to disclose, reveal, explain," from un- (2) "opposite of" + fold (v.). Similar formation in Middle Dutch ontvouden, German entfalten. Intransitive sense is attested from late 14c. Related: Unfolded; unfolding.
