Hawk and Handsaw
. I know a hawk from a handsaw. Handsaw is a corruption of hernshaw (a heron). I know a hawk from a heron, the bird of prey from the game flown at. The proverb means, I know one thing from another. (See Hamlet, ii. 2.)
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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.