being declared the winner of a sumo bout
Sumo term for the moment when the referee announces the winner's name after a bout. Not used in general sports contexts.
When the yokozuna received the winner's announcement, the arena was filled with loud applause.
Compound of 勝ち (kachi, 'win') and 名乗り (nanori, 'announcing one's name'). The reading かちなのり follows standard rendaku voicing.