What’s What
. He knows what’s what. He is a shrewd fellow not to be imposed on. One of the senseless questions of logic was “Quid est quid?”
“He knew what’s what, and that’s as high
As metaphysic wit can fly.”
Butler: Hudibras, part i. canto 1.
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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.