Antonyms for Block (opposite meaning)
WordNet sense 1 (cause to become unblocked):
unstuffWordNet sense 2 (free or remove obstruction from):
disengage, freeWordNet sense 3 (recall knowledge from memory; have a recollection):
recall, recollect, remember, retrieve, think, recall, recollect, call up, call backWordNet sense 4 (make (assets) available):
unblock, unfreezeFrom the ODE community, based on WordNetadd/edit