# throw a monkey wrench into the works

idiom

Source: https://englishreference.com/idiom/throw-a-monkey-wrench-into-the-works
Updated: 2026-08-10

## Meaning

Synonym of throw a spanner into the works.

## Examples

- The sudden rain threw a monkey wrench into the works for our picnic.
- Just as we were finishing the project, the manager threw a monkey wrench into the works by changing all the requirements.
- The unexpected resignation of the lead architect threw a monkey wrench into the works, forcing the firm to delay the entire construction project indefinitely.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.