Green’s Dictionary of Slang

dose of locust n.

[the locust or locust-wood club carried by New York policemen; however, this would seem to negate the use of fists]

(US, N.Y.) a thrashing with the fists.

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[UK] press cutting in J. Ware Passing Eng. of the Victorian Era 116/1: Mullaley, smarting under the pain of the wound, gave Mr Supple a dose of locust, which induced him to accompany the officer to court.