monkey wrench

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mon·key wrench • n. an adjustable wrench with large jaws that has its adjusting screw contained in the handle.• v. (mon·key·wrench) [tr.] inf. sabotage (something), esp. as a form of protest: [as n.] (monkeywrenching) the five defendants who received jail sentences for monkeywrenching. PHRASES: a monkey wrench in the works (or schedule, plan, etc.) a person or thing that prevents the successful implementation of a plan: even he couldn't throw a monkey wrench into the works a cancellation can throw a real monkey wrench into the schedule.DERIVATIVES: mon·key·wrench·er n.