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To "touch," "hit," "strike" a raw nerve - to upset someone by reminding him or her of a subject about which he or she has strong feelings.
1) Alex's mom recently died of lung cancer, so his sister hit a raw nerve by telling him that she had begun smoking.

2) Pam struck a raw nerve in Nick when she told him an anti-Semitic joke. Unbeknownst to Pam, Nick's grandmother died in the Holocaust.

3) Fat jokes touch a raw nerve in Samantha, who used to get made fun of in school for being overweight.
by na na na na na November 04, 2011
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