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throw a wrench into the works (to damage or change something in a way that ruins it or prevents it from working properly  merriam-webster.com Alex_Odeychuk) | |||
| do a disservice (Alex_Odeychuk) | |||
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| throw a wrench into the works (to damage or change something in a way that ruins it or prevents it from working properly merriam-webster.com Alex_Odeychuk) | |||
| do a disservice (Alex_Odeychuk) | |||