觸及要害;觸動痛處
hit / touch a (raw / sensitive) nerve
to mention a subject that makes sb feel angry, upset, embarrassed, etc.
You touched a raw nerve when you mentioned his first wife.你談起他的第一任妻子,這就觸到了他的痛處。
釋義來自《牛津高階英漢雙解詞典》第 9 版