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3. be out of (one's) mind

be out of (one's) mind

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be out of (one's) mind

slang To be crazy. This phrase can be followed by "with" and the cause of the craziness. He's out of his mind if he thinks this plan is going to work! After yet another sleepless night, I'm starting to feel like I'm out of my mind with exhaustion.

See also: mind, of, out