Unlock
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wiktionary
From Middle English unloken, unlouken, onlouken, from Old English onlūcan(“to unlock”), equivalent to un- + lock. Cognate with Dutch ontluiken(“to unlock”).
etymonline
unlock (v.)
c. 1400, from un- (2) "reverse, opposite of" + lock (v.). Figurative sense is attested from 1530s. Old English had unlucan "to unlock, open." Related: Unlocked; unlocking.
