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English definition of “lose the plot”

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lose the plot

UK informal
to no longer be able to act normally or understand what is happening: I can't believe Stuart did that - he must be losing the plot.
Translations of “lose the plot”
in Chinese (Traditional) 行爲怪異, 舉止愚蠢…
in Chinese (Simplified) 行为怪异, 举止愚蠢…
(Definition of lose the plot from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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