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Jyutping zi1 jin4
Pinyin zhī yán

Definitions (Wiktionary)
  1. verb, literary
    to be good at interpreting the words of others
  2. noun, literary
    friend keenly appreciative of one's talents; bosom friend; intimate friend; soul mate
    (syn.) 知遇, 知心朋友, 知己, 好友, 知心, 良朋, 执友, 知音, 同袍, 知友, 執友, 齒輪, 相知, 知交, 高朋, 良知, 友好
  3. noun, literary
    insightful words