un block

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

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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