verb (used with object)

  1. to undo the lock of (a door, chest, etc.), especially with a key.
  2. to open or release by or as if by undoing a lock.
  3. to open (anything firmly closed or joined): to unlock the jaws.
  4. to lay open; disclose: to unlock the secrets of one’s heart.

verb (used without object)

  1. to become unlocked.


  1. (tr) to unfasten (a lock, door, etc)
  2. (tr) to open, release, or let loose
  3. (tr) to disclose or provide the key tounlock a puzzle
  4. (intr) to become unlocked

v.c.1400, from un- (2) + lock (v.). Figurative sense is attested from 1530s. Related: Unlocked; unlocking.

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