expression, godan verb (-su)
Sumo term meaning to lose a bout, literally 'to drop a star'. Used in the context of sumo rankings where wins and losses are recorded as stars.
横綱が初日に星を落とした。
The yokozuna lost on the first day of the tournament.
Sumo expression from 星 (star, used for win/loss records) + を + 落とす (to drop). The exact origin is uncertain, but it reflects the traditional recording of bout results with stars.