Definition of “big word” - English Dictionary

british dictionary

“big word” in British English

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big wordnoun [ C ]

uk /ˌbɪɡ ˈwɜːd/ us /ˌbɪɡ ˈwɝːd/ informal

a long, difficult word, or a word that expresses a serious or important idea:

He tried to impress his teachers by using big words in all his essays.

(Definition of “big word” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)