The French say, “Fou (or Folle) comme le branlegai,” and more commonly “Gai comme un pinson” (a chaffinch). “Branlegai” is a dance, but the word is not in use now.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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