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Jyutping saam1 ciu4 jyun4 lou5
Pinyin sān cháo yuán lǎo

Definitions (CC-CANTO)
  1. employee who worked under three transitions of management/minister who served three transitions of emperor in China's history
Definitions (Wiktionary)
  1. phrase, historical, idiomatic
    important government official that has served under three dynasties or monarchs
  2. phrase, figuratively, idiomatic
    experienced person in an organization or company
Examples (粵典–words.hk)
  1. Cantonese
    三朝元老
    三朝元老
    saam1 ciu4 jyun4 lou5
    • veteran who has served three kings (or presidents, prime ministers nowadays)