unblock

[uhn-blok]
verb (used with object)
1.
to remove a block or obstruction from: to unblock a channel; to unblock a person's credit.
2.
Bridge. to play (a suit) so that the last card of the suit in one hand can provide access to the hand of the partnership having the longer holding in the suit.

Origin:
1605–15; un-2 + block

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
unblock (ʌnˈblɒk)
 
vb
to remove a blockage from (a pipe, etc)

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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Example sentences
The regulator can do the opposite, too: it can unblock the ribosome on command
  in order to start making that protein.
The heat generated will create a small vacuum that should unblock your ears and
  ease any pain.
They will also gain more leeway to block and unblock benefits.
But he said little about how to unblock the banking system or tame public
  spending.
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