English edit

 
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Etymology edit

over- +‎ train

Verb edit

overtrain (third-person singular simple present overtrains, present participle overtraining, simple past and past participle overtrained)

  1. (transitive, intransitive) To train too much or too long.
    Jim overtrained and found that he was exhausted by the time of the competition.
    I think I've overtrained my leg muscles.