know-it-all

Definition

Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc. of others.

Etymology

From know + it + all.

Example Sentences

• "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."
• "The same holds true for supporting details—they help you to learn more about a topic. Be a know it all by sharing these details and supporting details with friends."
• "She's a mean, bossy know-it-all."

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