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Jyutping neoi2 daai6 sap6 baat3 bin3
Pinyin nǚ dà shí bā biàn

Definitions (粵典–words.hk)
  1. 語句
    形容​女​仔大個​咗​之後變化​好​大​,​通常​指​好​嘅​變​化
    girls change a lot, and usually much better too, when they are growing up; literally: a girl will have 18 changes when she grows up
    • 佢靚咗好多,真係女大十八變!
      佢靓咗好多,真系女大十八变!
      keoi5 leng3 zo2 hou2 do1, zan1 hai6 neoi2 daai6 sap6 baat3 bin3!
      She is much more beautiful than before, she's really changed a lot after growing up!

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Jyutping neoi5 daai6 sap6 baat3 bin3
Pinyin nǚ dà shí bā biàn

Definitions (CC-CEDICT)
  1. lit. a girl changes eighteen times between childhood and womanhood (idiom)
  2. fig. a young woman is very different from the little girl she once was
Definitions (Wiktionary)
  1. phrase, idiomatic
    All of the changes that a girl makes when turning into a woman; blossom into womanhood
    • 女大十八變,她如今已成為亭亭玉立的小天鵝。
      女大十八变,她如今已成为亭亭玉立的小天鹅。
      nǚ dà shí bā biàn , tā rú jīn yǐ chéng wéi tíng tíng yù lì de xiǎo ti ā né .
      After having blossomed into womanhood, she has become a statuesque little swan.
Examples (粵典–words.hk)
  1. Cantonese
    佢靓咗好多,真系女大十八变!
    佢靚咗好多,真係女大十八變!
    keoi5 leng3 zo2 hou2 do1, zan1 hai6 neoi2 daai6 sap6 baat3 bin3!
    • She is much more beautiful than before, she's really changed a lot after growing up!
Examples (Wiktionary)
  1. Mandarin
    女大十八变,她如今已成为亭亭玉立的小天鹅。
    女大十八變,她如今已成為亭亭玉立的小天鵝。
    nǚ dà shí bā biàn , tā rú jīn yǐ chéng wéi tíng tíng yù lì de xiǎo ti ā né .
    • After having blossomed into womanhood, she has become a statuesque little swan.