(idiom) the two cannot exist together; used to describe a situation where two parties are so opposed that they cannot coexist or reach a compromise

to swear that both sides cannot exist together; to be completely incompatible or irreconcilable with an enemy due to deep hatred

literally meaning that Shu [[汉|漢|han4]] and the traitor [[魏|魏|wei4]] cannot both exist; used as an idiom to describe two enemies who cannot coexist under the same sky