吃一堑，长一智

吃一塹，長一智
chīyīqiàn,zhǎngyīzhì
Fall into the moat and you'll be wiser next time (idiom); One only learns from one's mistakes.

CEDICT

Entry Composition

=1 吃 chī
  1. to eat; to consume
  2. to eat at (a cafeteria etc)
  3. to eradicate; to destroy
  4. to absorb
  5. to suffer (shock, injury, defeat etc)
=1 吃 chī variant of 吃 chī
2 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
3 堑 qiàn (bound form) moat; chasm
4 长 zhǎng
  1. chief
  2. head
  3. elder
  4. to grow
  5. to develop
  6. to increase
  7. to enhance
5 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
6 智 zhì (literary) wise; wisdom