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Definition of know-it-all noun from the Oxford Advanced Learner's Dictionary

know-it-all

noun
 
/ˈnəʊ ɪt ɔːl/
 
/ˈnəʊ ɪt ɔːl/
(especially North American English)
(British English also know-all)
(informal, disapproving)
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  1. a person who behaves as if they know everything
See know-it-all in the Oxford Advanced American Dictionary
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trait
noun
 
 
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