[nì qǔ shùn shǒu]   

逆    取    顺    守    逆：背叛；顺：合理。背叛国君夺取天下，遵循常理治理国家。

逆取顺守，汉语成语，指背叛国君夺取天下，遵循常理治理国家。

Retain political power by fair means after capturing it by foul

逆道乱常    逆天违理    逆耳良言    逆臣贼子    逆取顺守