bird brain
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
A person who is not too smart; a person who acts stupid.
Where it’s used:
Used
Widespread English
Sources & notes
Imported from Wikipedia “English-language idioms” (CC BY-SA 4.0, retrieved 2026-07-29), pending review.
Common questions
What does “bird brain” mean?
A person who is not too smart; a person who acts stupid.
Is “bird brain” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.