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Definition of monkey wrench noun from the Oxford Advanced Learner's Dictionary

picture of an adjustable spanner

monkey wrench

noun

monkey wrench pronunciation English

monkey wrench pronunciation American

(British English also adjustable spanner)

a tool that can be adjusted to hold and turn things of different widths

compare spanner, wrench

Idioms

throw a monkey wrench in/into something

(also throw a wrench in/into something) (North American English, informal) to do something to spoil somebody's plans