The Kal-if-fee is a Vulcan "passion fight" to the death, in which two Vulcan males fight for the right to mate with a certain female. During the Vulcan mating ritual known as Koon-ut-kal-if-fee, a female can claim Kal-if-fee if she does not want the male arranged for her at childhood. At which point, the male arranged for her must fight the female's selected mate. (TOS: "Amok Time")
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