#1 unblock v. clear or remove an obstruction from; "the procedure unblocked his arteries". wn
#2 unblock v. play the cards of (a suit) so that the last trick on which a hand can follow suit will be taken by a higher card in the hand of a partner who has the remaining cards of a combined holding. wn
#3 unblock v. [unfreeze, free, release] make (assets) available; "release the holdings in the dictator's bank account". wn
vizzz