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Jyutping po3 tin1 fong1
Pinyin pò tiān huāng

Definitions (CC-CEDICT)
  1. unprecedented
  2. for the first time
  3. never before
  4. first ever
Definitions (粵典–words.hk)
  1. 形容詞
    前所未有
    in an unprecedented way; for the very first time
    • 開業五十周年紀念,本公司破天荒半價十日優惠顧客。
      开业五十周年纪念,本公司破天荒半价十日优惠顾客。
      hoi1 jip6 ng5 sap6 zau1 nin4 gei2 nim6, bun2 gung1 si1 po3 tin1 fong1 bun3 gaa3 sap6 jat6 jau1 wai6 gu3 haak3.
      (To celebrate) the fiftieth anniversary of the opening, our company will give/offer a 50% discount for ten days for the very first time to benefit our customers.
Definitions (Wiktionary)
  1. phrase, idiomatic
    unprecedented; unheard-of; for the first time
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    开业五十周年纪念,本公司破天荒半价十日优惠顾客。
    開業五十周年紀念,本公司破天荒半價十日優惠顧客。
    hoi1 jip6 ng5 sap6 zau1 nin4 gei2 nim6, bun2 gung1 si1 po3 tin1 fong1 bun3 gaa3 sap6 jat6 jau1 wai6 gu3 haak3.
    • (To celebrate) the fiftieth anniversary of the opening, our company will give/offer a 50% discount for ten days for the very first time to benefit our customers.