大破大立

dàpòdàlì
  1. to destroy the old and establish the new (idiom)
  2. radical transformation

CEDICT

澈底破壞舊有、傳統的思想與制度，然後建立起新的思想與制度。

重編國語辭典

徹底破壞古舊、傳統的體制並建立起新的思想與制度

維基詞典

Entry Composition

1 大破 dàpò
  1. (rail transport) severe damage
  2. severe damage
2 大 dà
  1. big; large; great
  2. older (than another person)
  3. eldest (as in 大姐 dàjiě)
  4. greatly; freely; fully
  5. (dialect) father
  6. (dialect) uncle (father's brother)
3 立 lì
  1. to stand
  2. to set up
  3. to establish
  4. to lay down
  5. to draw up
  6. at once
  7. immediately