Definition of unblocks:
(v) :
(transitive) To remove or clear a block or obstruction from.
(v) :
(transitive) To free or make available.
(v) :
(transitive) To enable communication again, via telephone, instant messaging, etc., with (somebody previously blocked).
(n) :
The removal of a block or blockage.
(v) :
(intransitive, card games) In whist, to throw away a high card so as not to interrupt one's partner's long suit.