The Istanbul twist is a method to break someone's neck by twisting it. While one can simply twist the victim's neck, the Istanbul twist works better when the victim's body is rotating in one direction and his or her neck is twisted in the opposite rotational direction.
"One guard in that doorway had a damaged face but was still moving; I gave his neck a treatment known in professional circles Earthside as the Istanbul twist. He joined his mates. " -Robert Heinlein, "The Moon is a Harsh Mistress"
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