throw a spanner in(to) the works(redirected from threw a spanner into the works)
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.