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English definition of “heyday”

heyday

noun [C usually singular] uk   /ˈheɪ.deɪ/ us  
the most successful or popular period of someone or something: In their heyday, they sold as many records as all the other groups in the country put together.Stages of lifeHigher and lower points of achievementSuccess and achievementsFailures
(Definition of heyday from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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