Quote:
Originally Posted by howard555
Meaning: If something hits a nerve, it upsets someone or causes them pain, often when it is something they are trying to hide.
I see other definitions but that ones seems to fit. .
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The phrase stems from dentistry. A person can stand drilling the enamel of the tooth with relatively little discomfort until the drill hits the nerve deep in the tooth. When that happens, the pain is sudden and intense, despite the fact that the same act of drilling hadn't caused such discomfort earlier.
In other words, it refers to absorbing a certain level of mistreatment with little response, and then suddenly the same mistreatment provokes an intense response.