触及要害;触动痛处
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.你谈起他的第一任妻子,这就触到了他的痛处。
释义来自《牛津高阶英汉双解词典》第 9 版