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Jyutping duk6 bou6 tin1 haa6
Pinyin dú bù tiān xià

Definitions (Wiktionary)
  1. phrase, idiomatic
    to be peerless
Examples (粵典–words.hk)
  1. Cantonese
    碧咸宣布挂靴,独步天下七旋斩料成绝响
    碧咸宣佈掛靴,獨步天下七旋斬料成絕響
    • David Beckham annouced retirement, his unique spinning cross will become a lost art