同どう士し打うち

noun

friendly fire; accidental killing of allies

Refers to accidentally attacking or killing one's own side in battle or conflict. Often used in military or historical contexts.

• 戦せん場じょうでは同どう士し討うちを避さけるために、目め印じるしをつけていた。

  On the battlefield, they wore markers to avoid friendly fire.

• その事じ故こは同どう士し討うちによるものだった。

  The incident was due to friendly fire.

noun

internecine strife; infighting among allies

Extended meaning: conflict or struggle within a group that should be united. Can be used metaphorically for political or organizational infighting.

• 党とう内ないの同どう士し討うちが選せん挙きょの敗はい因いんとなった。

  Infighting within the party led to the election loss.

• 同どう士し討うちをしている場ば合あいではない。

  This is no time for fighting among ourselves.