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Jyutping ji5 ji4 zai3 ji4
Pinyin yǐ yí zhì yí

Definitions (CC-CEDICT)
  1. to use foreigners to subdue foreigners (idiom); let the barbarians fight it out among themselves (traditional policy of successive dynasties)
  2. Use Western science and technology to counter imperialist encroachment. (late Qing modernizing slogan)