sink or swim
US /sɪŋk ɔr swɪm/
UK /sɪŋk ɔr swɪm/

1.
成败在此一举, 自生自灭
to fail or succeed entirely by one's own efforts, without help from anyone else
:
•
When he started his own business, it was a case of sink or swim.
当他开始自己的生意时,那是成败在此一举。
•
The new employees were told they would have to sink or swim.
新员工被告知他们必须自生自灭。