(Also as two words.) [FLASH a.3] a. One who is ‘flash’ or knowing; a companion of thieves; a bully, a ‘fancy-man.’ b. A sporting man; a patron of the ‘ring’; a ‘swell.’

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  a.  1789.  G. Parker, Life’s Painter, 141. A flash-man is a fellow that lives upon the hackneyed prostitution of an unfortunate woman of the town.

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1833.  Marryat, P. Simple (1863), 235. A large mob was collected in the street, vowing vengeance on us for our treatment of their flash man, and a row was to be expected.

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1859.  H. Kingsley, G. Hamlyn, v. ‘You ’re playing a dangerous game, my flash man, whoever you are.’

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  b.  1812.  Sporting Mag. XXXIX. Oct., 21/1. The display of flash-men, from the Peer on the coach-box, to the most gentlemanly-looking pick-pocket, was very complete.

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1819.  T. Moore Tom Crib’s Mem., 55.

        Instant the Ring was broke, and shouts and yells
From Trojan Flashmen and Sicilian Swells
Fill’d the wide heav’n.

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