以夷攻夷 いいこうい 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. 攻 offense. Read as コウ. Jinuma: Japanese Dictionary · Word lists