JMdict: 1982870

馬車馬 【ばしゃうま】

  1. [n] cart-horse; work-horse
  2. [n] doing something wholeheartedly; doing with one's undivided attention
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
馬 Horse バ うま, うま-, ま
車 Car シャ くるま