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Jyutping cai4 tau4
Pinyin qí tóu

Definitions (CC-CEDICT)
  1. at the same time
  2. simultaneously
  3. (when stating a quantity that is a round number) exactly
Definitions (粵典–words.hk)
  1. 形容詞
    通常​用​於​錢​銀上​,​為​找續​方便​或者​好意​頭​,​透過​增加​或​減少​金額​令數​目​嘅​尾​數​變​變​為​0
    usually used for bargaining (to avoid change or making an auspicious number) to round up or round down a price to the tens
    • 齊頭數
      齐头数
      cai4 tau4 sou3
      round number
    • 七十一咁零丁,不如齊頭收七十啦。
      七十一咁零丁,不如齐头收七十啦。
      cat1 sap6 jat1 gam3 ling4 ding1, bat1 jyu4 cai4 tau4 sau1 cat1 sap6 laa1.
      Seventy-one sounds imperfect. How about rounding it off to 70?
Definitions (Wiktionary)
  1. adj
    even; level; side by side
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
  2. 剛好 – 刚好
  3. 沒零頭 – 没零头
  4. 剛剛好 – 刚刚好
Examples (粵典–words.hk)
  1. Cantonese
    齐头并进未必保证效率高。
    齊頭並進未必保證效率高。
    cai4 tau4 bing6 zeon3 mei6 bit1 bou2 zing3 haau6 leot2 gou1.
    • Multi-tasking may not guarantee high efficiency.
  2. Cantonese
    齐头数
    齊頭數
    cai4 tau4 sou3
    • round number
  3. Cantonese
    七十一咁零丁,不如齐头收七十啦。
    七十一咁零丁,不如齊頭收七十啦。
    cat1 sap6 jat1 gam3 ling4 ding1, bat1 jyu4 cai4 tau4 sau1 cat1 sap6 laa1.
    • Seventy-one sounds imperfect. How about rounding it off to 70?