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Jyutping seoi2 jyu2
Pinyin shuǐ yú

Definitions (CC-CANTO)
  1. (noun) (animal) Trionychidae (soft-shelled turtle); (slang) a dupe / a patsy / an easy mark / a chump (a wealthy person who can be tricked by others easily)
Definitions (粵典–words.hk)
  1. 名詞、俚語
    鱉​,​一種​爬蟲類​軟殼​水生​龜​(​量​詞​:​條​)
    softshell turtle
  2. 名詞、俚語
    俾人​搵​笨​嘅​人​;​或者​係​容易​俾人​搵​笨​嘅​人​(​量​詞​:​條​)
    gullible person; victim of a fraud
    • 呢間餐廳影衰晒香港,收遊客貴一倍嘅錢,當人係水魚!
      呢间餐厅影衰晒香港,收游客贵一倍嘅钱,当人系水鱼!
      ni1 gaan1 caan1 teng1 jing2 seoi1 saai3 hoeng1 gong2, sau1 jau4 haak3 gwai3 jat1 pui5 ge3 cin2, dong3 jan4 hai6 seoi2 jyu2!
      This restaurant is a disgrace to Hong Kong! They make a dupe of tourists by charging them double!
Definitions (Wiktionary)
  1. noun, Cantonese, figuratively
    gullible person; victim of a fraud
  2. noun, Cantonese, Changsha, Pinghua, Southwestern-Mandarin, Xiang
    soft-shell turtle
Definitions (Kaifangcidian)
  1. 冤大頭 – 冤大头
  2. 笨蛋
  3. 傻瓜
  4. 傻子
  5. 甲魚 – 甲鱼
  6. 團魚 – 团鱼
  7. 黿 – 鼋
  8. 王八
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我相信这条鱼是淡水鱼。
    我相信這條魚是淡水魚。
    wǒ xiāng xìn zhè tiáo yú shì dàn shuǐ yú 。
    • I believe this fish is a freshwater fish.
  2. Mandarin
    我肯定这是淡水鱼。
    我肯定這是淡水魚。
    wǒ kěn dìng zhè shì dàn shuǐ yú 。
    • I believe this fish is a freshwater fish.
    • I'm sure that this is a fresh water fish.
Examples (粵典–words.hk)
  1. Cantonese
    戙企水鱼
    戙企水魚
    dung6 kei5 seoi2 jyu2
    • A human shape softshell turtle (a gullible person)
  2. Cantonese
    淡水鱼
    淡水魚
    taam5 seoi2 jyu2
    • river fish
  3. Cantonese
    咸水鱼
    鹹水魚
    haam4 seoi2 jyu2
    • saltwater fish; sea fish
    • a sea fish; literally, salty-water fish
  4. Cantonese
    淡水鱼好多寄生虫,唔好生食呀。
    淡水魚好多寄生蟲,唔好生食呀。
    taam5 seoi2 jyu2 hou2 do1 gei3 sang1 cung4, m4 hou2 saang1 sik6 aa3.
    • There are parasites in freshwater fish, don't eat them raw.
  5. Cantonese
    呢间黑店专㓥水鱼,唔好帮趁。
    呢間黑店專劏水魚,唔好幫趁。
    • This dodgy shop will only cheat customers, don't shop there.