unlash definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
to untie or loosen (something lashed, or tied with a rope, etc.)
unlash definition by American Heritage Dictionary
transitive verb un·lashed, un·lash·ing, un·lash·es
To untie the lashing of; loose.