By then she had only three years to live, and was becoming frail from overwork.
Dickens died young, at 58, worn out from overwork, from the sheer strain of being himself.
Chronic starvation, overwork, disease, and freezing temperatures were as effective as the bullet, only slower and crueler.
"work beyond a person's strength," 1819; see overwork (v.). Old English oferweorc meant "a superstructure, sarcophagus, tomb."