Seiken Mawashi Gedan Barai is a technique in Kyokushin karate. It translates to 'Roundhouse Downward Block with the Forefist.' This technique involves executing a circular sweeping motion with the forefist to block incoming low-level strikes. The term 'Seiken' refers to the forefist, 'Mawashi' indicates a roundhouse motion, 'Gedan' refers to the lower level, and 'Barai' means block. It is commonly used to deflect kicks or sweeps targeting the legs or lower body.