Work excessively hard

• Use too much
• The act working too much or too long

Wiktionary Word definitions in Wiktionary
vb. (present participle of overwork English)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Overwork \O`ver*work"\, v. t. [imp. & p. p. Overworked or Overwrought ; p. pr. & vb. n. Overworking .] To work beyond the strength; to cause to labor too much or too long; to tire excessively; as, to overwork a horse. To fill too full of work; to crowd ...

WordNet Word definitions in WordNet
n. the act working too much or too long; "he became ill from overwork" [syn: overwork ]