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Jyutping waat6 tin1 haa6 zi1 daai6 kai1
Pinyin huá tiān xià zhī dà jī

Definitions (Wiktionary)
  1. phrase, idiomatic
    to be comical; to be ridiculous; to be laughable

滑天下之大稽 [------]

Jyutping
Pinyin huá tiān xià zhī dà jī

Definitions (CC-CEDICT)
  1. to be the most ridiculous thing in the world (idiom)