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Region: UK | Usage example: The vendor missing the deadline threw a spanner in the works for the launch.

Throw a spanner in the works

Meaning

To cause a disruption or unexpected problem.

Usage

Used when someone or something interferes with plans.

Origin & History

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Mechanical imagery from British workshops, where a spanner (wrench) jamming the machinery stops progress.

Used more broadly in twentieth century Britain, especially around factories.

Related Idioms

Throw a wrench in the works

Disrupt a plan or process.

Throw a wobbly

Have a sudden fit of anger or frustration.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Barking up the wrong tree

Accusing or pursuing the wrong person/idea; making a false assumption.