Meaning of “smug” in the English Dictionary

"smug" in British English

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smugadjective

uk /smʌɡ/ us /smʌɡ/ smugger, smuggest disapproving
smugness
noun [ U ] uk /ˈsmʌɡ.nəs/ us /ˈsmʌɡ.nəs/

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

"smug" in American English

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smugadjective [ -er/-est only ]

us /smʌɡ/ -gg- disapproving

very pleased and satisfied with yourself, and having no doubt about the value of what you know or have done:

(Definition of “smug” from the Cambridge Academic Content Dictionary © Cambridge University Press)