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Jyutping sing2 sing2 ding6 ding6
Pinyin xǐng xǐng dìng dìng

Definitions (CC-CANTO)
  1. better watch out!; better be careful!; wise up!; pay attention! (given as an advice or warning) [colloquial]
Definitions (粵典–words.hk)
  1. 形容詞
    保持​專注​唔​出錯
    do the right thing!; do the clever thing!
    • 你醒醒定定,唔好亂講嘢呀。
      你醒醒定定,唔好乱讲嘢呀。
      nei5 sing2 sing2 ding6 ding6, m4 hou2 lyun2 gong2 je5 aa3.
      Mind your words when you speak.
    • 等陣醒醒定定,唔好俾海關捉住呀。
      等阵醒醒定定,唔好俾海关捉住呀。
      dang2 zan6 sing2 sing2 ding6 ding6, m4 hou2 bei2 hoi2 gwaan1 zuk1 zyu6 aa3.
      Be alert and don't get caught by the custom.
Definitions (Kaifangcidian)
  1. 打醒精神
  2. 提起精神來 – 提起精神来
  3. 看清楚一點 – 看清楚一点
Examples (粵典–words.hk)
  1. Cantonese
    嚟紧有几单大茶饭,大家要醒醒定定!
    嚟緊有幾單大茶飯,大家要醒醒定定!
    lei4 gan2 jau5 gei2 daan1 daai6 caa4 faan6, daai6 gaa1 jiu3 sing2 sing2 ding6 ding6!
    • There will be a lot of action coming soon. Be smart, guys!
  2. Cantonese
    你醒醒定定,唔好乱讲嘢呀。
    你醒醒定定,唔好亂講嘢呀。
    nei5 sing2 sing2 ding6 ding6, m4 hou2 lyun2 gong2 je5 aa3.
    • Mind your words when you speak.
  3. Cantonese
    等阵醒醒定定,唔好俾海关捉住呀。
    等陣醒醒定定,唔好俾海關捉住呀。
    dang2 zan6 sing2 sing2 ding6 ding6, m4 hou2 bei2 hoi2 gwaan1 zuk1 zyu6 aa3.
    • Be alert and don't get caught by the custom.