noun
amateur sumo
Refers to sumo wrestling practiced at an amateur level, as opposed to professional (大相撲). Used in contexts like university clubs, local tournaments, and international competitions.
彼は大学でアマ相撲をやっている。
He does amateur sumo at university.
アマ相撲の全国大会が来月開かれる。
The national amateur sumo tournament will be held next month.