Senses
逆鳞/ 逆鱗 unfavorable scales
(Chinese legend) a patch of scales on a dragon's neck that grow in the opposite direction; touching them enrages the dragon
逆鳞/ 逆鱗 trigger issue
(figurative) a sensitive subject or a person's sore spot that provokes a strong emotional reaction or anger when challenged
逆鳞/ 逆鱗 to offend a superior
to offend the emperor or a person in high authority, often by challenging them or touching on a sensitive topic