1889, from Japanese judo, literally "gentle way," from ju "softness, gentleness" (from Chinese jou "soft, gentle") + do "way, art," from Chinese tao "way." "A refined form of ju-jitsu introduced in 1882 by Dr. Jigoro Kano, using principles of movement and balance, and practiced as a sport or form of physical exercise" [OED]. Related: Judoist.
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