the GNU version of the Collaborative International Dictionary of English
v. To disencumber of a clog, or of difficulties and obstructions; to free from encumbrances; to set at liberty.
The Century Dictionary and Cyclopedia
To disencumber of what clogs; relieve of difficulties or obstructions; free from encumbrances.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. become or cause to become unobstructed
Word Usage
"The great lie is that this bail out will 'unclog' the credit pipes -- as if other people are sitting around with trillions of dollars ready to buy out junk bonds at above-market prices."