Meaning of “bighead” in the English Dictionary

british dictionary

"bighead" in British English

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bigheadnoun [ C ]

uk /ˈbɪɡ.hed/ us /ˈbɪɡ.hed/ disapproving

someone who thinks that they are more important or cleverer than they really are:

He's always boasting. He's such a bighead!

(Definition of “bighead” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)