前功盡廢

前功尽废
qiángōngjìnfèi

synonym of 前功盡棄 /前功尽弃 (qiángōngjìnqì, “all previous achievements go down the drain; all the previous effort is wasted”)

Wiktionary

Entry Composition

1 前功 qiángōng
  1. (literary) previous achievements; previous deeds
  2. previous achievements; previous deeds
2 盡 jìn
  1. to use up
  2. to exhaust
  3. to end
  4. to finish
  5. to the utmost
  6. exhausted
  7. finished
  8. to the limit (of sth)
  9. all
  10. entirely
3 廢 fèi
  1. to abolish
  2. to abandon
  3. to abrogate
  4. to discard
  5. to depose
  6. to oust
  7. crippled
  8. abandoned
  9. waste