know-it-all (to be a) [adj]

Meaning:

• Somebody who proudly comments on every subject and imagines that he or she is expert in all fields.

Examples:

1. She is unjustifiably arrogant and talks about every subject that is brought up everywhere. She is a real know-it-all.
2. I appreciate your input, but don’t act like a know-it-all; we’re brainstorming together.
3. His know-it-all attitude made the group project a challenge.
4. John’s know-it-all personality quickly alienated his coworkers.
5. I stopped asking him for advice because he always acts like a know-it-all.
6. She’s such a know-it-all, always correcting everyone at the dinner table.
7. We can’t collaborate effectively when one team member acts like a know-it-all.
8. The new intern is smart but comes off as a know-it-all in meetings.
9. Don’t ask her about the project; she’s such a know-it-all!