# throw a spanner in the works

idiom

Source: https://englishreference.com/idiom/throw-a-spanner-in-the-works
Updated: 2026-08-10

## Meaning

To introduce a problem, dilemma or obstacle, something unexpected or troublesome.

## Examples

- The sudden rain threw a spanner in the works for our picnic.
- We were ready to launch the website, but a last-minute server error threw a spanner in the works.
- The unexpected resignation of the lead architect threw a spanner in the works, forcing the entire construction project to be delayed 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.