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Jyutping seoi2 se4 jiu1
Pinyin shuǐ shé yāo

Definitions (CC-CEDICT)
  1. slender and supple waist
  2. lithe body
  3. feminine pose
Definitions (粵典–words.hk)
  1. 名詞
    女性​嘅​纖​腰​(​量​詞​:​條​)
    (of women) slender waistline; literally: water snake waist
    • 水蛇腰同水桶腰都好難話係一線之差喎。
      水蛇腰同水桶腰都好难话系一线之差㖞。
      seoi2 se4 jiu1 tung4 seoi2 tung2 jiu1 dou1 hou2 naan4 waa6 hai6 jat1 sin3 zi1 caa1 wo3.
      There is an impassable difference between being slender and having a spare tire.
Definitions (Wiktionary)
  1. noun, figuratively, of women
    slim waist
Examples (粵典–words.hk)
  1. Cantonese
    水蛇腰同水桶腰都好难话系一线之差㖞。
    水蛇腰同水桶腰都好難話係一線之差喎。
    seoi2 se4 jiu1 tung4 seoi2 tung2 jiu1 dou1 hou2 naan4 waa6 hai6 jat1 sin3 zi1 caa1 wo3.
    • There is an impassable difference between being slender and having a spare tire.