To overwhelm, or be overwhelmed (by a person or issue), as though with oxygen deprivation.
To die due to, or kill someone by means of, insufficient oxygen supply to the body.
To destroy; to extinguish.
To suffer, or cause someone to suffer, from severely reduced oxygen intake to the body.
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.