To absorb, as a gas by a metal.
To obstruct, cover, or otherwise block (an opening, a portion of an image, etc.).
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).