Chudan Yonhon Nukite is a technique in Kyokushin karate. It translates to 'Middle-Level Four-Finger Strike.' This technique involves thrusting all four fingers together in a spearhand formation targeting the opponent's midsection or torso. The term 'Chudan' refers to the middle level, 'Yonhon' indicates four fingers, and 'Nukite' refers to the thrusting motion. It is commonly used to attack vital points such as the solar plexus, ribs, or abdomen with precision and force.