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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.

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Definitions of unlock

unlock (v.)
open the lock of;
unlock the door
unlock (v.)
set free or release;
unlock (v.)
become unlocked;
The door unlocked from the inside
From wordnet.princeton.edu