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).
The removal of a block or blockage.
To defrost something.
To resume movement.
To release from a previously locked or frozen state.
To thaw.
To release previously suspended financial assets.