Throw a wrench in the works.

Throw a wrench in the works.
To "throw a wrench in the works" is to create a sudden obstacle that prevents something from going as planned. Picture a literal wrench thrown into machinery, grinding it to a halt—the chaos it causes mimics the disruption caused in one's plans.
His sudden resignation really threw a wrench in the works.
His sudden resignation disrupted everything.
Just when we thought the project was on track, the software glitch threw a wrench in the works.
The software glitch disrupted the project just when we thought it was on track.
The unexpected weather threw a wrench in the works, delaying the construction schedule by a week.
The unexpected weather disrupted the construction schedule, causing delays.
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Went belly up" is a casual idiom meaning to fail completely, resembling a fish turned belly up in the water, which is dead. This phrase is often used in business contexts⋯ Read the full article
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