sumo wrestler       
noun [ C ] uk/ˈsuː.məʊ ˌres.lər/ us/ˈsuː.moʊ ˌres.lɚ/
 相扑手
someone who does sumo wrestling as a sport
  At 630 pounds, he was the heftiest sumo wrestler.  他体重 630 磅,是最重的相扑选手。 
 See: sumo wrestling
 - More examples
 - It's claimed he once pinned a famous sumo wrestler to the ground using just one finger.
 - The sumo wrestler wears a thick, elaborately tied canvas belt around his gut with a sling thing that slips between the legs; it's called the mawashi.
 - In Japan, all sumo wrestlers belong to a stable, a gym/dormitory where most of them live and where all of them train under the supervision of a master, himself a former wrestler.
 - He was tall, enormously big, with the physique of a Sumo wrestler.