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know–it–all

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know–it–all/ˈnowətˌɑːl/noun
pluralknow–it–alls
know–it–all
/ˈnowətˌɑːl/
noun
pluralknow–it–alls
Learner's definition of KNOW–IT–ALL  
[count]informal + disapproving
: a person who talks and behaves like someone who knows everything — often used before another noun
— called also "British"know-all
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