To upset or offend someone by touching on a sensitive topic.
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To say something that upsets someone by touching a sensitive spot.
When you strike a nerve, the reaction is stronger than you expected.
It usually means you have hit on something that matters deeply to them.
"Hit a Sore Spot"
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Very similar — touching a painful or sensitive topic; slightly more about past wounds
"Touch a Nerve"
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Nearly identical — both mean triggering an emotional reaction; touch a nerve is slightly softer
"Strike a Nerve"
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Triggering a strong emotional reaction by touching on something personal or sensitive