Dictionary
mon'key wrench"
1. Also called,
esp. Brit., adjustable spanner. a wrench having an adjustable jaw permitting it to grasp nuts or the like of different sizes.
2. something that interferes with functioning; obstacle:
He threw a monkey wrench into our plans. mon•key-wrench
Pronunciation: (mung'kē-rench"), [key]—
v.t.
to ruin (plans, a schedule, etc.) unavoidably or, sometimes, deliberately:
The storm monkey-wrenched our plans for a picnic.
—
v.i.
to prevent, delay, or sabotage industrialization or development of wilderness areas, esp. through vandalism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.