know-it-all

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Definitions from WordNet

Noun know-it-all has 1 sense

know-it-all, know-all - someone who thinks he knows everything and refuses to accept advice or information from others
--₁ is a kind of egotist, egoist, swellhead

Definitions from the Web

Know-it-all

Definition:

A know-it-all is a person who acts as if they have comprehensive knowledge or expertise in every subject, frequently imposing their opinions on others.

Senses:

Noun: A person who claims or appears to know everything.
Adjective: Describing a person who frequently and annoyingly asserts their knowledge on various topics.

Examples:

Sense: Noun

1. Even though Tom was just a freshman, he always acted like a know-it-all in the physics class.

2. My uncle is such a know-it-all, he constantly interrupts conversations to prove his vast knowledge.

Sense: Adjective

1. Susan's know-it-all attitude made it difficult for her to maintain friendships.

2. The know-it-all professor dismissed any questioning of his expertise in the subject.

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