play for keeps
玩得很認真，盡力爭取最終勝利或成功的情況
口語·強調認真競爭
英文釋義
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.
典故來源
源自兒童游戲，指贏家可以永久保留輸家的彈珠等物品，后引申為認真對待、不留余地。