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dunce's cap

noun [C usually singular]
 
 
/ˈdʌn.sɪzˌkæp/ (US usually dunce cap)

Definition

a tall paper hat with a pointed end that in the past children had to wear in school if they had made many mistakes in their workThings worn to cover the head, face or neck
(Definition of dunce's cap noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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