sandlot
/ˈsændlɒt/noun
1- N. Amer. a piece of unoccupied land used by children for games〈北美〉（儿童做游戏用的）空地。
1.1
- as modifier denoting or relating to sport played by amateurs（体育运动）业余的：
sandlot baseball.
业余棒球运动。