以夷制夷 いいせいい Also written 以夷征夷 Meanings Noun controlling foreigners by foreigners; playing one barbarian state against another See also: 夷を以て夷を制す (いをもっていをせいす). Kanji 以 from. Read as イ. 夷 barbarian; savage; Ainu. Read as イ. 制 control. Read as セイ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists