Source : Webster's Revised Unabridged Dictionary (1913)

Overtoil \O`ver*toil"\, v. t.
   To overwork.

Overtoil \O`ver*toil"\, v. t.
   To weary excessively; to exhaust.

         Then dozed a while herself, but overtoiled By that
         day's grief and travel.                  --Tennyson.