Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
transitive verb, intransitive verb
to open: said of something clenched, or clinched
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
verb un·clenched, un·clench·ing, un·clench·es verb, transitive
To loosen from a clenched position; relax: unclench one's fists.verb, intransitive
To become unclenched.