play for keeps
玩得很认真，尽力争取最终胜利或成功的情况
口语·强调认真竞争
英文释义
To engage in a competition or activity with serious or permanent consequences; to be committed and determined to win or succeed.
例句
This is a serious competition, so we're playing for keeps from the start.
典故来源
源自儿童游戏，指赢家可以永久保留输家的弹珠等物品，后引申为认真对待、不留余地。