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monkey wrench

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monkey wrenchnoun
pluralmonkey wrenches
monkey wrench
noun
pluralmonkey wrenches
Learner's definition of MONKEY WRENCH  
[count]
: a wrench that can be adjusted to grip or turn things of different sizes — used in U.S. English to refer especially to a large, heavy wrench with a long, straight handle

throw/hurl/toss a monkey wrench into

US, informal
: to damage or change (something) in a way that ruins it or prevents it from working properly
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