What does 'Wrench in the works' mean?

If someone puts or throws a wrench, or monkey wrench, in the works, they ruin a plan. In British English, 'spanner' is used instead of 'wrench'.

Idioms similar to 'Wrench in the works'


All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.

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