ˋshìㄅㄨˋㄌㄧㄤˇliǎngㄌㄧˋ

  1. 立誓絕對不和敵對並立天地形容仇恨七俠五義·五七》:病夫誓不兩立。」彭公案·》:那裡這裡誓不兩立。」不共戴天勢不兩立

the two cannot exist together (idiom)​; irreconcilable differences, incompatible standpoints