Learn what "have you lost your mind" means, when people say it, and how to use it naturally in English.

It is a strong insult meaning the speaker thinks the other person is behaving irrationally.
From On One Condition, Episode 29
The speaker is angrily asking whether the other person has become insane or reckless.
Use it only in very heated arguments or dramatic fiction. It is rude and can easily escalate conflict.
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