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 replace stale or noxious air with fresh.
To provide with a vent.
To provide manual or mechanical breathing to a patient.
To circulate air through a building, etc.
To expose something to the circulation of fresh air.
To expose something to public examination or discussion.
To shoot with a firearm; to pierce with bullets.