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English definition of “have a screw loose”

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have a screw loose

infml to seem crazy: Her brother definitely has a screw loose – I don't really trust him.
Translations of “have a screw loose”
in Chinese (Traditional) 行爲乖戾, 神經有點不正常…
in Chinese (Simplified) 行为乖戾, 神经有点儿不正常…
(Definition of have a screw loose from the Cambridge Academic Content Dictionary © Cambridge University Press)
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