for keeps
要來要去的；假意的；不認真的
口語·表達永久擁有或嚴肅對待
英文釋義
to keep or retain indefinitely, to possess permanently
例句
This time we're playing for keeps, no more practice rounds.
典故來源
源自兒童游戲，尤其是彈珠游戲，贏家可永久保留輸家的彈珠。