1894 Brewer’s / D / Down
He is quite down in the mouth. Out of spirits; disheartened. When persons are very sad and low-spirited, the corners of the mouth are drawn down. “Down in the jib” is a nautical phrase of the same meaning.
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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.