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The idiom “a spanner in the works” (or sometimes “a wrench in the works” in American English) means an unexpected problem or obstacle that disrupts or interferes with a plan, process, or system.
Imagine a well-oiled machine (or works) operating smoothly and efficiently. If you were to throw a spanner (wrench) into this machine, it would cause it to stop or malfunction. Similarly, when something unexpected or disruptive occurs that derails a planned course of action or creates complications, it can be described as “a spanner in the works.”
In essence, the idiom highlights the impact of unforeseen difficulties or challenges that hinder progress or cause problems in achieving a goal or completing a task.
The meaning of the idiom A spanner in the works is a person or thing that prevents the successful implementation of a plan.