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English definition of “nervous breakdown”

nervous breakdown

noun [C usually singular] uk   us  
a period of mental illness, usually without a physical cause, which results in anxiety, difficulty in sleeping and thinking clearly, a loss of confidence and hope, and a feeling of great sadness: He suffered a nervous breakdown in his twenties.Mental and psychiatric disorders
(Definition of nervous breakdown from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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