Definition of monkey wrench noun from the Oxford Advanced American Dictionary

 

monkey wrench

 noun
noun
 
 
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  • a tool that can be adjusted to hold and turn things of different widths
  • Idioms
    throw a monkey wrench in/into the works(also throw a wrench in/into the works)(informal)
     
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    to do something to spoil someone's plans
    See the Oxford Advanced Learner's Dictionary entry: monkey wrench