Definition of know-it-all

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< knowing

knowledge >

know-it-all (n

t-ôl

) KEY

NOUN:
Informal

One who claims to know everything and rejects advice or information from others.

OTHER FORMS:
know-it-all (Adjective)

Thesaurus: synonyms for know-it-all

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The American Heritage® Dictionary of the English Language, Fourth Edition.
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