zì​shēng​zì​miè

run its course

自生自灭 (自生自滅) zì​shēng​zì​miè
run its course expression
to emerge and perish on its own; to run its course

If no one looks after these plants, they will just have to sink or swim on their own.

Frequency

Movie subtitles
1.85 per million appears in 1% of films
Written text
0.804 per million

Sources

Definitions
CC-CEDICT