noun
seven-a-side football; football 7
A variant of football (soccer) played with seven players on each side, often on a smaller pitch. The term is a Japanese wasei-eigo abbreviation of 'soccer' and 'seven'.
ソサイチは7人制のサッカーです。
Sosaichi is seven-a-side football.
週末に友達とソサイチをした。
I played seven-a-side football with friends on the weekend.