/ · 1894 Brewer’s · P · Pig-iron
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This is a mere play upon the word sow. When iron is melted it runs off into a channel called a sow, the latʹeral branches of which are called the pigs; here the iron cools, and is called pig-iron.
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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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