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Jyutping zou2 tau2
Pinyin zǎo tǒu

Definitions (Wiktionary)
  1. verb, Cantonese
    to go to bed early; to sleep early
    • 要长春不老 早起早唞就最好
      要长春不老 早起早唞就最好
      jiu3 coeng4 ceon1 bat1 lou5, zou2 hei2 zou2 tau2 zau6 zeoi3 hou2
      If you want to be eternally young, it's best to get up early and go to sleep early
  2. intj, Cantonese
    shut up; drop dead; go away; go to hell (using sleep as a metaphor of death)
  3. intj, Cantonese
    good night; have a good night