Definition
This idiom is used to indicate that someone will die or be forced to stop doing something; it can also suggest that something will come to an end.
完了，命不保
If he makes one more mistake, it will be curtains for him.
如果他再犯一次錯誤，他就完蛋了。
Once that scandal breaks, it will be curtains for their business.
一旦那件醜聞曝光，他們的生意就完了。
If they don't change their strategy, it'll be curtains for them.
如果他們不改變策略，他們就完了。