subs. phr. (common).—A high-spirited horse; a thoroughbred.

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  1819.  T. MOORE, Tom Crib’s Memorial to Congress, 10.

        C—NNG came in a job, and then canter’d about
On a showy, but hot and unsound, BIT OF BLOOD.

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  1843.  DICKENS, Martin Chuzzlewit, II., p. 156. Not that we slacken in our pace the while, not we: we rather put the BITS OF BLOOD upon their mettle.

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