To expel; to put out.
To omit from consideration.
To bar (someone or something) from entering; to keep out.
To refuse to accept (evidence) as valid.
To eliminate from diagnostic consideration.
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.