師夷長技以制夷 [师－长－－－－]

Jyutping si1 ji4 coeng4 gei6 ji5 zai3 ji4
Pinyin shī yí cháng jì yǐ zhì yí

Definitions (CC-CEDICT)
  1. "learn from the foreigners in order to gain command of them", idea advocated by Wei Yuan 魏源[Wei4 Yuan2]