To become free or untangled.
To unravel; to separate into discrete components or units.
To free something from entanglement; to extricate or unknot.
To free or make available.
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 enable communication again, via telephone, instant messaging, etc., with (somebody previously blocked).
The removal of a block or blockage.