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Jyutping m4 goi1 saai3
Pinyin wú gāi sài

Definitions (CC-CANTO)
  1. thank you very much (for services/ favors rather than gifts) [colloquial]
Examples (Wiktionary)
  1. Cantonese
    唔该嗮!
    唔該嗮!
    m4 goi1 saai3!
    • Thank you very much!