Definition of "overwork"

overwork¹

/ˌəʊvəˈwɜːk/

verb
third-person singular simple present overworks, present participle overworking, simple past and past participle overworked or overwrought
1. (transitive) To make (someone or something) work too hard.
  Quotations
  For some years locomotives and coaches have been overworked and undermaintained to a degree without precedent in British railway history, and the leeway in maintenance now to be made up is very great.
  1945 November snd December, Cecil J. Allen, “British Locomotive Practice and Performance”, in Railway Magazine, page 329
2. (intransitive) To work too hard.
3. (transitive) To fill too full of work; to crowd with labour.
  Quotations
  My days with toil are overwrought.
  1874, Henry Wadsworth Longfellow, The Aigalades
4. (transitive) To decorate all over.

overwork²

/ˈəʊvəˌwɜːk/

noun
uncountable
1. a superstructure
2. excessive work
  Quotations
  Various disordered conditions consequent upon overwork, which are characteristic of modern civilisation.
  1878, Phosphorus in functional disorders of the nervous system, induced by overwork and other influences incidental to modern life
  […] it had obtained from its constituents rather antiquated and inefficient equipment, which scarcely stood up to overwork; […] .
  1946 July and August, K. Westcott Jones, “Isle of Wight Central Railway—2”, in Railway Magazine, page 244
  When it comes to overwork, denial looms large.
  1996, Wilkie Au, Urgings of the Heart: A Spirituality of Integration
  The Japanese term for sudden death from overwork.
  2003, Ernie J Zelinski, Joy of Not Working: A Book for the Retired, Unemployed, and Overworked