or scowrer, subs. (old).—1.  ‘Drunkards, beating the Watch, breaking Windows, clearing the Streets, &c. (B. E.: also GROSE): whence (2) a night-thief. Hence TO SCOUR THE STREETS = to act riotously.

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  c. 1700.  W. DARREL, The Gentlemen Instructed, 491 [10 ed., 1732]. He spurr’d to London, and left a thousand Curses behing him. Here he struck up with Sharpers, SCOURERS, and Alsatians.

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  1712.  STEELE, Spectator, 324. Bullies and SCOWERERS of a long standing.

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  1712.  GAY, Trivia, iii. 325.

        Who has not heard the SCOWERER’S midnight fame?
Who has not trembled at the Mohock’s name?

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