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over·train | \ ˌō-vər-ˈtrān 
\
\overtrained; overtraining; overtrains
Definition of overtrain
: to train (a person or animal) to excess or beyond advantage : to harm (a person or animal) by too much training
an athlete who overtrains Don't overtrain your dog. Lots of small lessons are better than one big one.— Larrie Todd
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Time Traveler for overtrain
The first known use of overtrain was in 1872
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