• WordNet 3.6
    • v overexert exert (oneself) excessively and go beyond one's strength "don't overexert yourself when exercising!"
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Webster's Revised Unabridged Dictionary
    • v. t Overexert To exert too much.
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Century Dictionary and Cyclopedia
    • overexert To exert or exercise too much; exert (oneself) to excess: usually reflexive.
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In literature:

I have overexerted myself; I am dreadfully fatigued.
"The Law and the Lady" by Wilkie Collins
You mustn't overexert yourself; you mustn't catch a chill this cold night.
"Armadale" by Wilkie Collins
It was overexertion, Miss.
"The Sleuth of St. James's Square" by Melville Davisson Post
In his rage he had overexerted himself.
"The Valley of Silent Men" by James Oliver Curwood
Kurt warned him not to overexert himself, and the father never heard.
"The Desert of Wheat" by Zane Grey
Wild and nervous subjects, if not so confined, will probably overexert the affected parts if allowed the freedom of a paddock or pasture.
"Lameness of the Horse" by John Victor Lacroix
It was overexertion, he said.
"Bad Hugh" by Mary Jane Holmes
He had hemorrhage from overexertion, and afterward a chill.
"The Stolen Singer" by Martha Idell Fletcher Bellinger
Hard experience had taught him the dire results of exposure and overexertion.
"Quin" by Alice Hegan Rice
Overwork or overexertion often causes the greater number of fatal cases of congestion of the lungs.
"Special Report on Diseases of the Horse" by United States Department of Agriculture

In news:

Every year, almost a million people are forced to take time off from work due to repetitive motion injuries or overexertion.
Help Prevent Overexertion Injuries at Work and at Home National Safety Council calls on public to help reverse trend.
National Safety Council Focuses on Preventing Overexertion.
Overexertion is the third leading cause of injury in the United States.
An estimated 3.5 million overexertion injuries occur every year.
Drink water and don't overexert .
National Safety Council Focuses on Preventing Overexertion .
Overexertion is the third leading cause of injury in the United States.
In 2004, some 3,700 workers were injured from overexertion in lifting—by far the biggest category of warehouse injury type.