unclog

To clear a blockage from (a drain, for example).

To disencumber of what clogs; relieve of difficulties or obstructions; free from encumbrances.

To disencumber of a clog, or of difficulties and obstructions; to free from encumbrances; to set at liberty.

To remove a blockage from.

To have a blockage removed.

become or cause to become unobstructed