noun.
A hold, in wrestling, in which an opponent's arm is twisted up behind his back; an armlock
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a wrestling hold in which the opponent's arm is twisted up behind his back
Word Usage
"Brokers don't like the fact that the combined group will have a hammerlock on Europe's futures markets—which they say makes it tougher for newcomers and raises the specter of high fees."