Nishi definitions

(sumo) The left-hand (less prestigious) side of the banzuke (番付, “ranking list”)
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(sumo) A rikishi (力士, “sumo wrestler”) listed on the left side of the banzuke.
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(sumo) The western side of the ring.
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Origin of nishi

From Japanese 西 (nishi, “west”), from the way the western or left side of the sumo ranking list is considered less prestigious, by analogy with the setting sun as opposed to the rising sun.