Liliputin-3790

Darwin's Theory of Evolution threw a monkey wrench into plans
of the Roman Catholic Church to dominate the Great Britain entirely ... "
Winston Churchill

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throw a monkey wrench into
throw a monkey wrench in(to) (something)
To disrupt, foil, or cause problems to a plan, activity, or project. Primarily heard in US.
We had everything in line for the party, but having the caterer cancel on us at the last minute really threw a monkey wrench into our plans!
It'll really throw a monkey wrench in the works if the board decides not to increase our funding for this project.
See also: monkey, throw, wrench
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
throw a monkey wrench into
Sabotage or frustrate a project or plans, as in The boss threw a monkey wrench into our plans when he said we'd have to work Saturday. This transfer of industrial sabotage-that is, throwing a tool inside machinery-to other subjects dates from the early 1900s.
See also: monkey, throw, wrench
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
See also:
put a (monkey) wrench in(to) the works
put a spanner in(to) the works
put/throw a spanner in the works
throw a monkey wrench in(to) (something)
throw a spanner in the works
throw a spanner in(to) the works
throw a wrench into the works
throw a (monkey) wrench in(to) the works
throw a monkey wrench in the works
put a spoke in someone's wheel