Know-it-all meaning

nōĭt-ôl
Frequency:
One who claims to know everything and rejects others' advice or information.
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Pretending or claiming to know much about almost everything.
adjective
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A know-it-all person.
noun
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(pejorative) Someone who obnoxiously claims to be knowledgeable on a subject.

We had it all figured out, but this know-it-all marched in with "the correct way of solving it", leaving our experiment in shambles.

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