- a wrench having an adjustable jaw permitting it to grasp nuts or the like of different sizes.
- something that interferes with functioning; obstacle: He threw a monkey wrench into our plans.
- to ruin (plans, a schedule, etc.) unavoidably or, sometimes, deliberately: The storm monkey-wrenched our plans for a picnic.
- to prevent, delay, or sabotage industrialization or development of wilderness areas, especially through vandalism.
- a wrench with adjustable jaws
