Definition of birdbrain noun from the Oxford Advanced Learner's Dictionary

 

birdbrain

 noun
noun
BrE BrE//ˈbɜːdbreɪn//
 
; NAmE NAmE//ˈbɜːrdbreɪn//
 
(especially North American English) Stupid
 
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a stupid person See related entries: Stupid
See the Oxford Advanced American Dictionary entry: birdbrain