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Jyutping bun3 tung2 seoi2
Pinyin bàn tǒng shuǐ

Definitions (CC-CEDICT)
  1. (coll.) (of one's skills, knowledge etc) limited
  2. superficial
  3. half-baked
  4. sb with a smattering of knowledge (of sth)
  5. dabbler
Definitions (粵典–words.hk)
  1. 名詞
    形容​能力​麻麻​,​學藝​未​精​,​指淨​係​識​一部​份​,​未能​完全​掌握
    imperfectly learnt; literally: half bucket of water
    • 佢樣樣嘢都半桶水,冇樣嘢學得成。
      佢样样嘢都半桶水,冇样嘢学得成。
      keoi5 joeng6 joeng6 je5 dou1 bun3 tung2 seoi2, mou5 joeng6 je5 hok6 dak1 seng4.
      He dabbles in everything and achieves nothing.
Definitions (Wiktionary)
  1. adj, colloquial
    limited (of one's skills, knowledge, etc.)
  2. noun, colloquial
    smatterer; amateur; dabbler
    (syn.) 半桶师, 半瓶子醋, 半瓶醋, 半桶师仔, 半桶師仔, 半精戆, 半路师, 半精戇, 半桶師, 𫧃半精, 半桶屎, 𣍐半精, 半路師
Definitions (Kaifangcidian)
  1. 半瓶醋
  2. 半吊子
  3. 半懂不懂
  4. 只懂皮毛
  5. 懂得不多
Examples (粵典–words.hk)
  1. Cantonese
    佢样样嘢都半桶水,冇样嘢学得成。
    佢樣樣嘢都半桶水,冇樣嘢學得成。
    keoi5 joeng6 joeng6 je5 dou1 bun3 tung2 seoi2, mou5 joeng6 je5 hok6 dak1 seng4.
    • He dabbles in everything and achieves nothing.