Pronunciation: (un-klog', -klôg'), [key]
—v., -clogged, -clog•ging.
to free of an obstruction or impediment: to unclog a drain; to unclog rush-hour traffic.
to become unclogged: I can't wash the dishes until the drain unclogs.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.