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One who acts as if he or she knows everything, as by offering unsolicited advice or rejecting others' suggestions.
another word for know-all
a person who acts as though he or she had better knowledge or understanding than anyone else.
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|Noun||1.||know-it-all - someone who thinks he knows everything and refuses to accept advice or information from others|
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech