Webster's Revised Unabridged Dictionary · 1913

Overwork

Overwork , transitive verb

1.
To work beyond the strength; to cause to labor too much or too long; to tire excessively; as, to overwork a horse.
2.
To fill too full of work; to crowd with labor.
My days with toil are overwrought. — Longfellow
3.
To decorate all over.

Overwork , intransitive verb

To work too much, or beyond one's strength.

Overwork , noun

Work in excess of the usual or stipulated time or quantity; extra work; also, excessive labor.