ㄌㄧㄤˇㄏㄨˇㄒㄧㄤㄉㄡˋliǎnghǔ‑xiāngdòu

两虎相斗
  1. 比喻強大勢力互相爭鬥兩虎相爭」。 兩虎相鬥,必有一傷」。

two tigers fight (idiom)​; fig. a dispute between two major contestants, a battle of the giants