throw a spanner in(to) the works

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throw a spanner in(to) the works

To disrupt, foil, or cause problems to a plan, activity, or project. Primarily heard in UK. We had everything in line for the party, but having the caterer cancel on us at the last minute really threw a spanner in the works! It'll really throw a spanner into the works if the board decides not to increase our funding for this project.
See also: spanner, throw, work