overwork
US /ˌoʊ.vɚˈwɝːk/
UK /ˌoʊ.vɚˈwɝːk/

1.
work too hard or cause to work too hard
:
•
She tends to overwork herself during busy periods.
•
The manager was accused of making his employees overwork.
1.
excessive work
:
•
He suffered from overwork and stress.
•
The company is trying to reduce overwork among its employees.