dunce's cap
英 [ˈdʌnsɪz kæp]
美 [ˈdʌnsɪz kæp]
n. (旧时有时给学习迟钝的学生戴的)笨蛋圆锥帽
牛津词典
noun
- （旧时有时给学习迟钝的学生戴的）笨蛋圆锥帽
a pointed hat that was sometimes given in the past to a child in a class at school who was slow to learn
英英释义
noun
- a cone-shaped paper hat formerly placed on the head of slow or lazy pupils
Synonym: dunce capfool's cap