grand champion filling the rank of champion to keep their number at two
Sumo term. When there is only one yokozuna, the highest-ranked ozeki is temporarily treated as a yokozuna for ranking purposes to maintain the traditional two-yokozuna format on the banzuke.
In a tournament with only one yokozuna, a yokozuna-ozeki may be established.
Compound of 横綱 (yokozuna, 'grand champion') and 大関 (ozeki, 'champion'), referring to an ozeki who is treated as a yokozuna for ranking purposes.