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Jyutping tin1 haa6 dai6 jat1
Pinyin tiān xià dì yī

Definitions (CC-CEDICT)
  1. first under heaven
  2. number one in the country
Definitions (Wiktionary)
  1. phrase, idiomatic
    number one in the world; peerless; unequaled
Examples (粵典–words.hk)
  1. Cantonese
    天下第一
    天下第一
    tin1 haa6 dai6 jat1
    • first in the world
Examples (Wiktionary)
  1. Mandarin
    世上最可笑的是那些“知识里手”,有了道听涂说的一知半解,便自封为“天下第一”,适足见其不自量而已。
    世上最可笑的是那些“知識裏手”,有了道聽塗説的一知半解,便自封為“天下第一”,適足見其不自量而已。
    shì shàng zuì kě xiào de shì nà xiē “ zhī shi lǐ shǒu ” , yǒu le dào tīng tú shuō de yī zhī bàn jiě , biàn zì fēng wéi “ tiān xià dì yī ” , shì zú jiàn qí bù zì liàng ér yǐ .
    • The most ridiculous person in the world is the “know all” who picks up a smattering of hearsay knowledge and proclaims themselves “the world's Number One authority”; this merely shows that they have not taken a proper measure of themselves.