Learn what "i hope you know what you're doing" means, when people say it, and how to use it naturally in English.

It means the speaker is unsure the other person has thought things through and is warning them.
From Killer Romance, Episode 23
The speaker warns someone that their actions may be risky or foolish.
Use this when you want to express doubt about someone’s decisions. It can sound skeptical or critical, especially in tense situations.
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