sink or swim
成語所屬單字sink
sink or swim — 慣用語
1. to be in a situation where you must succeed by your own efforts or fail complete
1.慣用語
釋義
成敗全靠自己；自生自滅；不成功便成仁
to be in a situation where you must succeed by your own efforts or fail completely, with no help from anyone else.
例句
The new trainees were given no guidance — it was sink or swim from day one.
Starting your own business is a sink-or-swim situation that tests every skill you have.