Source : WordNet®

unblock
     v 1: 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
     2: make (assets) available; "release the holdings in the
        dictator's bank account" [syn: {unfreeze}, {free}, {release}]
        [ant: {freeze}, {freeze}]