Sekirov Dictionary

throw a spanner in the works

verb1

•
(UK) To introduce a problem, dilemma or obstacle, something unexpected or troublesome.
- Halfway through the production of Macbeth, the director found that the stage was smaller than he had expected. This really threw a spanner in the works.

forms

threw a spanner in the works · thrown a spanner in the works · throwing a spanner in the works · throws a spanner in the works

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