1894 Brewer’s / E / Eat One’s Heart Out (To)
To fret or worry unreasonably; to allow one grief or one vexation to predominate over the mind, tincture all one’s ideas, and absorb all other emotions.
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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.