兩ㄌㄧㄤˇliǎng虎ㄏㄨˇhǔ相ㄒㄧㄤxiāng鬥ㄉㄡˋdòu，必ㄅㄧˋbì有ㄧㄡˇyǒu一ㄧyī傷ㄕㄤshāng

（諺語）比喻兩強互相爭鬥，必然會有一方傷敗。《三國演義·第六二回》：「今兩虎相鬥，必有一傷。須誤了我大事。吾與你二人解勸，休得爭論。」也作「兩虎相爭，必有一傷。」

英when two tigers fight, one will get injured (idiom), if it comes to a fight, someone will get hurt.