[app. originally from BROWN in sense of ‘gloomy’; but this sense has been to a great extent forgotten. (The conjecture that brown ‘might be’ the Ger. braune ‘brow’ does not require serious notice.)]

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  A state of mental abstraction or musing: ‘gloomy meditations’ (J.); ‘serious reverie, thoughtful absent-mindedness’ (Webster); now esp. an idle or purposeless reverie.

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1532.  Dice-Play, 6. Lack of company will soon lead a man into a brown study.

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1579.  Lyly, Euphues (Arb.), 80. You are in some brown study, what colours you might best wear.

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1607.  Topsell, Serpents, 772. Nothing but sadnesse, and heavinesse of minde, brown-studies.

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1693.  Oxford-Act, 2. Oft wou’d the new created Sophister Where Boy cry’d, want ye any Coffee, Sir? Start from brown-study.

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1712.  Steele, Spect., No. 286, ¶ 3. He often puts me into a brown Study how to answer him.

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1871.  Blackie, Four Phases, I. 13. He had been standing there in a brown study.

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