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Jyutping hoi1 dou1
Pinyin kāi dāo

Definitions (CC-CEDICT)
  1. (of a surgeon) to perform an operation
  2. (of a patient) to have an operation
  3. to decapitate
  4. to behead
  5. to single out as a point of attack
Definitions (CC-CANTO)
  1. (verb) o undergo a surgery
Definitions (粵典–words.hk)
  1. 動詞
    做​手術
    to undergo a surgery; literally: to open the knife
    • 醫生話要開刀割咗個瘤喎!
      医生话要开刀割咗个瘤㖞!
      ji1 sang1 waa6 jiu3 hoi1 dou1 got3 zo2 go3 lau2 wo5!
      The doctor said that the tumor has to be surgically removed.
  2. 動詞
    向​某​啲​人​做​啲​唔​好​嘅​嘢
    to do something bad to somebody
    • 佢決定向員工開刀。
      佢决定向员工开刀。
      keoi5 kyut3 ding6 hoeng3 jyun4 gung1 hoi1 dou1.
      He decided to cut down number of staffs.
    • 政府要穩定樓市,都唔應該揾市民開刀。
      政府要稳定楼市,都唔应该揾市民开刀。
      zing3 fu2 jiu3 wan2 ding6 lau4 si5, dou1 m4 jing1 goi1 wan2 si5 man4 hoi1 dou1.
      Even if the government wants to cool down the property market, it shouldn't do it at the expense of citizens.
Definitions (Wiktionary)
  1. verb, figuratively, verb-object
    to make somebody the first target of an attack
  2. verb, archaic, verb-object
    to behead; to decapitate
  3. verb, verb-object
    to perform a (medical) operation (with the use of a scalpel or similar instrument)
    • 對他開刀
      对他开刀
      duì tā kāi dāo
      operate on him
  4. verb, figuratively, verb-object
    to fire; to sack
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    医生话要开刀割咗个瘤㖞!
    醫生話要開刀割咗個瘤喎!
    ji1 sang1 waa6 jiu3 hoi1 dou1 got3 zo2 go3 lau2 wo5!
    • The doctor said that the tumor has to be surgically removed.
  2. Cantonese
    佢决定向员工开刀。
    佢決定向員工開刀。
    keoi5 kyut3 ding6 hoeng3 jyun4 gung1 hoi1 dou1.
    • He decided to cut down number of staffs.
  3. Cantonese
    政府要稳定楼市,都唔应该揾市民开刀。
    政府要穩定樓市,都唔應該揾市民開刀。
    zing3 fu2 jiu3 wan2 ding6 lau4 si5, dou1 m4 jing1 goi1 wan2 si5 man4 hoi1 dou1.
    • Even if the government wants to cool down the property market, it shouldn't do it at the expense of citizens.
Examples (Wiktionary)
  1. Mandarin
    对他开刀
    對他開刀
    duì tā kāi dāo
    • operate on him
  2. Mandarin
    这病非得马上开刀不可。
    這病非得馬上開刀不可。
    zhè bìng fēi děi mǎ shàng kāi dāo bù kě .
    • This disease calls for an immediate operation.