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English definition of “nervous breakdown”

nervous breakdown

noun [C usually singular]    
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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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