overwork

Short definition from Wiktionary

Verb

1. 1
   To make (someone or something) work too hard.
2. 2
   To work too hard.
3. 3
   To fill too full of work; to crowd with labour.
4. 4
   To decorate all over.

Noun

1. 1
   A superstructure.
2. 2
   Excessive work.