nervous breakdown

noun
(not in technical use) any disabling mental disorder requiring treatment.

Origin:
1900–05, Americanism

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Collins
World English Dictionary
nervous breakdown
 
n
any mental illness not primarily of organic origin in which the patient ceases to function properly, often accompanied by severely impaired concentration, anxiety, insomnia, and lack of self-esteem; used esp of episodes of depression

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

nervous breakdown n.
A severe or incapacitating emotional disorder, especially when occurring suddenly and marked by depression.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
After he got back, he achieved some success as a songwriter, but then had a
  nervous breakdown.
Looking back at the past few months, it's fair to wonder if the country isn't
  going through a nervous breakdown.
At one point she suffered a nervous breakdown and had to be hospitalized and
  sedated.
The next year she failed to report for work on three successive films and was
  reported to be suffering from a nervous breakdown.
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