Chinese
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!
!shake; to rock
!head; (noun suffix)
!sway; to shade; dazzle
!brain
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!trad. (搖頭晃腦)
| 搖
| 頭
| 晃
| 腦
|-
!simp. (摇头晃脑)
| 摇
| 头
| 晃
| 脑
|-
!Intercalation of 搖晃／摇晃 (yáohuàng) and 頭腦／头脑 (tóunǎo).
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Idiom
搖頭晃腦
- to wag one's head; to look pleased with oneself; assume an air of self-approbation/self-conceit