Japanese wrestling (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">japanese wrestling</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sumo that I've seen before include "one of the martial arts" , "Type of Japanese wrestling" , "Japanese wrestling for huge men" , "Japanese form of wrestling" , "Style of traditional Japanese wrestling" .)
(Other definitions for jujitsu that I've seen before include "Japanese method of unarmed self-defence" , "Japanese unarmed combat" , "Samurai's unarmed self-defence martial art" , "Samurai self-defence" , "Jap. unarmed combat" .)