The French for COLOUR. Hence couleur de rose rose-color, pink; borrowed in Eng., a. as adj. ‘rose-colored,’ ‘roseate’; b. as adv. ‘in a rosy light, in an aspect to which fancy lends undue attractions.’

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1783.  H. Walpole, Lett. to Earl Strafford, June 24. I confess my reflections are couleur de rose at present.

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1835.  Hood, Poetry, Prose, & Worse, xxxiii. Our warfare is deadly and horrid … Nor tinted with couleur de rose.

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1851.  W. R. Greg, Misc. Ess., Ser. II. 143. Not disposed to draw a picture couleur de rose of the condition of our people.

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