Shuto Hizo Uchi is a technique in Kyokushin karate. It translates to 'Knife-Hand Kidney Strike.' This technique involves delivering a strike with the knife hand to the opponent's kidney area. The term 'Shuto' refers to the knife hand, 'Hizo' indicates the kidney, and 'Uchi' refers to the strike. It is commonly used to target the kidneys for effective disruption and potential incapacitation.