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Jyutping sau2 dou1
Pinyin shǒu dāo

Definitions (粵典–words.hk)
  1. 名詞
    一種​打擊​技術​,​拇指​緊閉​,​其餘四指​伸直​合​併​成刀​劍​狀​,​用​於​攻擊​敵人​要害​或作​防守​用​。
    knifehand strike; karate chop; literally "hand knife"
    • 手刀打後頸唔會即刻暈㗎,唔好睇戲睇上腦。
      手刀打后颈唔会即刻晕㗎,唔好睇戏睇上脑。
      sau2 dou1 daa2 hau6 geng2 mm4 wui5 zik1 haak1 wan4 gaa3, mm4 hou2 tai2 hei3 tai2 soeng5 nou5
      You won't faint after a knifehand strike at the back of your neck. Don't take the movies too serious.

手刀 [--]

Jyutping
Pinyin shǒu dāo

Definitions (CC-CEDICT)
  1. hand formed into a flat shape, as for a karate chop
Examples (粵典–words.hk)
  1. Cantonese
    手刀打后颈唔会即刻晕㗎,唔好睇戏睇上脑。
    手刀打後頸唔會即刻暈㗎,唔好睇戲睇上腦。
    sau2 dou1 daa2 hau6 geng2 mm4 wui5 zik1 haak1 wan4 gaa3, mm4 hou2 tai2 hei3 tai2 soeng5 nou5
    • You won't faint after a knifehand strike at the back of your neck. Don't take the movies too serious.