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Jyutping wun6 jin4 jat1 san1
Pinyin huàn rán yī xīn

Definitions (CC-CEDICT)
  1. to look completely new (idiom); brand new
  2. changed beyond recognition
Definitions (粵典–words.hk)
  1. 語句
    將舊​有​嘅​整理​、​改變​一番​,​改成​新氣象
    to look brand-new
    • 客廳徹底執完之後煥然一新。
      客厅彻底执完之后焕然一新。
      haak3 teng1 cit3 dai2 zap1 jyun4 zi1 hau6 wun6 jin4 jat1 san1.
      After a complete tidy-up, the living room looks brand-new.
Definitions (Wiktionary)
  1. phrase, idiomatic
    brand new; changed beyond recognition
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    适度的运动让身心焕然一新。
    適度的運動讓身心煥然一新。
    shì dù de yùn dòng ràng shēn xīn huàn rán yī xīn 。
    • Moderate exercise will refresh both mind and body.
Examples (粵典–words.hk)
  1. Cantonese
    客厅彻底执完之后焕然一新。
    客廳徹底執完之後煥然一新。
    haak3 teng1 cit3 dai2 zap1 jyun4 zi1 hau6 wun6 jin4 jat1 san1.
    • After a complete tidy-up, the living room looks brand-new.