1894 Brewer’s / C / Coaling
in theatrical slang, means telling phrases and speeches, as, “My part is full of ‘coaling lines.ʹ” Coal being money, means profit, whence coaling. (See p. 265, To post the Coal …)
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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.