Pronunciation: (un-blok'), [key]
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.