To prevent from scoring; to perform a shutout.
To hide from sight.
To refuse to be open and vulnerable toward.
To prevent from entering; to block or exclude.
The removal of a block or blockage.
To remove or clear a block or obstruction from.
In whist, to throw away a high card so as not to interrupt one's partner's long suit.
To free or make available.
To enable communication again, via telephone, instant messaging, etc., with (somebody previously blocked).