unlock

[uhn-lok]
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)
5.
to become unlocked.

Origin:
1350–1400; Middle English unloken; see un-2, lock1

unlockable, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unlock (ʌnˈlɒk)
 
vb
1.  (tr) to unfasten (a lock, door, etc)
2.  (tr) to open, release, or let loose
3.  (tr) to disclose or provide the key to: unlock a puzzle
4.  (intr) to become unlocked
 
un'lockable
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

unlock
c.1400, from un- (2) + lock (v.). Fig. sense is attested from 1531.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Two keys, perhaps, are wanted to unlock the cabinet.
Its attractions are the keys which unlock my thoughts and make me acquainted
  with myself.
In order to do that, you'll need to unlock the phone.
Almost all the carriers will unlock them for their customers.
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