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Jyutping lou5 san4
Pinyin lǎo chén

Definitions (Wiktionary)
  1. noun, humble, literary, sometimes
    old servant; old minister
    (syn.) 舊臣, 旧臣
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    老臣子
    老臣子
    lou5 san4 zi2
    • senior staff member; etymologically, senior official
  2. Cantonese
    话晒佢都系公司嘅老臣子,咁多年嚟冇功都有劳吖。
    話晒佢都係公司嘅老臣子,咁多年嚟冇功都有勞吖。
    waa6 saai3 keoi5 dou1 hai6 gung1 si1 ge3 lou5 san4 zi2, gam3 do1 nin4 lai4 mou5 gung1 dou1 jau5 lou4 aa1.
    • After all he's senior in the company. He's paid efforts.