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Jyutping zi6 dong3
Pinyin zì dāng

Definitions (Wiktionary)
  1. adv, literary
    naturally should; of course should
Examples (粵典–words.hk)
  1. Cantonese
    习武之人,路见不平,自当拔刀相助。
    習武之人,路見不平,自當拔刀相助。
    zaap6 mou5 zi1 jan4, lou6 gin3 bat1 ping4, zi6 dong1 bat1 dou1 soeng1 zo6.
    • People who know Kung Fu should offer their help against injustice.
  2. Cantonese
    古时生在帝王家,自当享尽荣华富贵。
    古時生在帝王家,自當享盡榮華富貴。
    gu2 si4 sang1 zoi6 dai6 wong4 gaa1, zi6 dong1 hoeng2 zeon6 wing4 waa4 fu3 gwai3.
    • Born in the royal family in the ancient times, one would have a prosperous life.