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Jyutping gwok3 sau2
Pinyin guó shǒu

Definitions (CC-CEDICT)
  1. (sports) member of the national team
  2. national representative
  3. (medicine, chess etc) one of the most highly skilled practitioners in one's country
Definitions (CC-CANTO)
  1. people who specialize in a certain skills and reach the highest level in the whole nation
Definitions (粵典–words.hk)
  1. 名詞
    精通​某種​技能​,​例如​醫道​、​棋藝​、​運動​等等​,​並​且​喺​全​國​水平​最高​嘅​人​;​也​有作​「​大國手​」​。
    expert in a specific area, e.g. medicine, chess, sports, etc, reaching a national level
    • 佢技術精湛,可堪國手。
      佢技术精湛,可堪国手。
      He is so skillful to be called a top practitioner.
Definitions (Wiktionary)
  1. noun
    player on a national team
  2. noun
    national champion; grand master (of a doctor, chess player, etc.)
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    以佢嘅医术,佢绝对称得上系城中嘅大国手。
    以佢嘅醫術,佢絕對稱得上係城中嘅大國手。
    • With his fine skills in surgery, he is fully worthy of being called the best doctor in town.
  2. Cantonese
    佢技术精湛,可堪国手。
    佢技術精湛,可堪國手。
    • He is so skillful to be called a top practitioner.