throw a wrench in the gears: Idiom Meaning and Origin

Throwing a wrench in the works, or as it is more commonly known, "throwing a monkey wrench into the works", is an idiomatic expression that is closely related to the phrase "throw a wrench in the gears." Both idioms share the common theme of disrupting or hindering progress or success. The primary difference between the two is the addition of the word "monkey" in the former idiom, which is used to emphasize the unexpected and often chaotic nature of the disruption.

The phrase "throw a monkey wrench into the works" originated in the United States and is believed to have first appeared in the early 20th century. Its exact origins are uncertain, but it is thought to have emerged from the influence of British and American industrial workers who used similar idioms involving tools and machinery. The addition of the word "monkey" in this idiom serves to heighten the sense of havoc and chaos caused by the disruption.

The idiom "throw a monkey wrench in the works" has become a widely used expression to describe any action or event that unexpectedly derails or obstructs a plan or project. It conveys the idea of an unforeseen complication or obstacle that can significantly impact the outcome and progress of a situation.

Similarly, the phrase "throw a spanner in the works" is another idiomatic expression that shares a similar meaning to "throw a wrench in the gears." The main difference between the two is the use of the word "spanner," which is a British term for a wrench. This idiom is primarily used in British English and is less commonly used in American English.