touch somebody on the raw 揭疮疤

“揭疮疤”，中文俗语，字面意思是“揭开某人的伤口（tear the scab right off somebody's sore）”，通常比喻揭露人的短处、痛处，戳到痛点，英文可以翻译为“touch somebody on the raw”或“touch somebody's sore spot”。

例句：

不要总是揭人的疮疤。

Don't always touch others' sore spot.

我无意中提起了瓦妮莎的新发型，让她很不高兴。这是在揭她的疮疤。

I accidentally touched Vanessa on the raw by mentioning her new haircut—apparently, she's really unhappy with it.