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 doubts the other person’s judgment or decision.
From One Night, One Forever, Episode 25
The speaker questions whether the other person really knows what they are doing.
Use this when you want to question a risky choice or decision. It can sound skeptical or warning-like, so it may feel tense in an argument.
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