Seiken Gedan Juji Uke is a technique in Kyokushin karate. It translates to 'Forefist Low-Level X Block.' This technique involves executing a blocking motion with the forefists crossed in an X shape to defend against low-level attacks. The term 'Seiken' refers to the forefist, 'Gedan' indicates the low level, 'Juji' means cross, and 'Uke' refers to the block. It is commonly used to deflect kicks or strikes aimed at the lower body.