subs. phr. (old).—1.  Gin (GROSE).

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  1755.  The Connoisseur, 30 Jan., No. 53. Madam Gin has been christened by as many names as a German princess: every petty chandler’s shop will sell you SKY-BLUE.

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  2.  (common).—Diluted or ‘separated’ milk.

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  1800.  BLOOMFIELD, The Farmer’s Boy. And strangers tell of ‘three times skimmed SKY-BLUE.’

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  d. 1845.  HOOD, A Retrospective Review.

                        That mild SKY-BLUE
That washed my sweet meals down.

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  1864.  G. A. SALA, Quite Alone, xv. Cake and wine existed no more in her allure; she was suggestive only of bread and scrape and SKY-BLUE.

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