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Jyutping mok6 jik6 zi1 gaau1
Pinyin mò nì zhī jiāo

Definitions (CC-CEDICT)
  1. intimate friendship
  2. bosom buddies
Definitions (粵典–words.hk)
  1. 名詞
    志同道合​嘅​好​朋友
    like-minded, intimate friends
Definitions (Wiktionary)
  1. phrase, idiomatic
    very close friends (with complete mutual understanding)