A wrench in the works
Meaning
Something that unexpectedly disrupts a plan or process and causes significant problems.
Origin
Picture the intricate gears and levers of a grand, clanking machine, humming along perfectly, each part playing its role in a symphony of industry. Then, imagine a heavy, metal wrench—a tool meant for maintenance, not mischief—careening into its heart, jamming the cogs, stripping the gears, and bringing everything to a screeching, grinding halt. This vivid, mechanical catastrophe is the literal scene that gave birth to the phrase 'a wrench in the works' around the early 20th century, particularly in American English. The 'works' referred to the inner mechanisms of complex machinery, and anything that suddenly introduced chaos into that delicate, ordered system was akin to a misplaced tool causing utter pandemonium. It quickly became the perfect metaphor for any unexpected problem that derails a well-laid plan or smooth operation.
Examples
- Everything was running smoothly until the sudden budget cut threw a wrench in the works, delaying the entire project by weeks.
- Her unexpected resignation really put a wrench in the works for the team's presentation next week, as she held crucial information.