金蘭之交 [－兰－－]

Jyutping gam1 laan4 zi1 gaau1
Pinyin jīn lán zhī jiāo

Definitions (CC-CEDICT)
  1. intimate friendship (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    sworn brotherhood; intimate friendship
    (syn.) 八拜之交