Overwork

Definition:

(v. t.) To work beyond the strength; to cause to labor too much or too long; to tire excessively; as, to overwork a horse.
(v. t.) To fill too full of work; to crowd with labor.
(v. t.) To decorate all over.
(v. t.) To work too much, or beyond one's strength.
(n.) Work in excess of the usual or stipulated time or quantity; extra work; also, excessive labor.

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overword vs. overwork