throw a monkey wrench into

throw a monkey wrench into something

to cause something to fail We keep trying to get together, but her crazy schedule keeps throwing a monkey wrench into our plans.
See also: monkey, throw, wrench

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
References in periodicals archive ?
Even though we plan and have good procedures in place, something is going to go out of control and throw a monkey wrench into our efforts.
What we see now is, in addition to a sincere effort, also a bold diplomatic move to derail this headlong rush towards war that exists here in the United States and try to throw a monkey wrench into the machinery of war,'' Mr Ritter told the BBC Radio 4 Today programme.
Deputy Director Widell said the change from the previous 101-decibel requirement to 96 is a measurable change that doesn't throw a monkey wrench into what manufacturers can do.
Earlier this year I vowed that Americans United would throw a monkey wrench into Pat Robertson's political machine," said Lynn.
Bankruptcies, mergers and acquisitions throw a monkey wrench into such plans.
If today's surge higher is any indication, upgrades from the rather bearish bunch of analysts configured against the shares could certainly throw a monkey wrench into any bearish designs on SUNW.
We think this is a complete departure at the 11th hour, once again, to throw a monkey wrench into the process.
Commented Lynn, "Last year when the Christian Coalition said it would draft 100,000 churches into its political machine, I vowed that Americans United would throw a monkey wrench into those works.
Financial and lending institutions, which occupy about a third of New York's office space, appear to have started to cut back on their space requirements, and that trend, if it gains momentum, could throw a monkey wrench into the Midtown recovery.
There were great expectations that this ancient fellow would throw a monkey wrench into previous notions of the course of early hominid evolution.
However, his need for donations to his presidential campaign could throw a monkey wrench into the emerging clean vehicle industry in California.
Yet, Sheffield's agent, Scott Boras, sounded his own siren that could throw a monkey wrench into any deal.
We can't predict a lot of things that can throw a monkey wrench into the plan.