To cause a sudden problem that stops progress.
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To cause a sudden problem that stops progress.
When something throws a wrench in the works, the plan was running fine until an unexpected obstacle jammed it.
The image is machinery seizing the moment a tool falls into the moving parts.
"Move the Goalposts"
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Change the rules after people already started
"Rock the Boat"
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Disturb a calm situation others want left alone
"Throw a Wrench in the Works"
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Jam a working plan with a sudden obstacle