touch / hit a (raw) nerve

touch / hit a (raw) nerve to mention something that makes someone upset, angry, or embarrassed, especially accidentally〔尤指无心地〕触到敏感话题，触到痛处:•Without realizing, he had touched a raw nerve.无意间他触到了别人的痛处。

• NATO
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• Malignant Hypertensions
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