前功 [－－]

Jyutping cin4 gung1
Pinyin qián gōng

Definitions (Wiktionary)
  1. noun, literary
    previous achievements; previous deeds
Examples (粵典–words.hk)
  1. Cantonese
    我哋唔可以俾佢打乱部署，唔系就会前功尽废。
    我哋唔可以俾佢打亂部署，唔係就會前功盡廢。
    ngo5 dei6 m4 ho2 ji5 bei2 keoi5 daa2 lyun6 bou6 cyu5, m4 hai6 zau6 wui5 cin4 gung1 zeon6 fai3
    • We cannot let him disrupt our plans, else it will be all for naught.
  2. Cantonese
    你而家放弃就前功尽废㗎喇！
    你而家放棄就前功盡廢㗎喇！
    nei5 ji4 gaa1 fong3 hei3 zau6 cin4 gung1 zeon6 fai3 gaa3 laa3!
    • If you give up now, all your efforts will be wasted.
  3. Cantonese
    箍完牙最紧要系戴牙托，唔系就会前功尽废架喇。
    箍完牙最緊要係戴牙托，唔係就會前功盡廢架喇。
    • One of the most important things after having your braces off is to wear your retainers, or else it would be useless.
Examples (Wiktionary)
  1. Mandarin
    前功尽弃
    前功盡棄
    qián gōng jìn qì
    • all the previous effort is wasted