E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Pulling.
A jockey trick, which used to be called playing bootyi.e. appearing to use every effort to come in first, but really determined to lose the race.
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Mr. Kemble [in the Iron Chest] gave a slight touch of the jockey, and played booty. He seemed to do justice to the play, but really ruined its success.George Colman the Younger.