have a screw loose Meaning in Cambridge English Dictionary
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Meaning of "have a screw loose" - English Dictionary

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have a screw loose

informal
If you say that someone has a screw loose, you mean that they behave in a strange way and seem slightly mentally ill.
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 Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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