Chudan Hiraken Tsuki is a technique in Kyokushin karate. It translates to 'Middle-Level Ridge Hand Thrust.' This technique involves delivering a thrusting strike with the ridge hand targeting the opponent's midsection or torso. The term 'Chudan' refers to the middle level, 'Hiraken' indicates the ridge hand, and 'Tsuki' refers to the thrusting motion. It is commonly used to attack the opponent's solar plexus, ribs, or abdomen with precision and force.