事半功倍

shìbàngōngbèi
(idiom) to achieve twice the result with half the effort

CEDICT

语本《孟子．公孙丑上》：「当今之时，万乘之国，行仁政，民之悦之，犹解倒悬也。故事半古之人，功必倍之，惟此时为然。」指费力少而收效大。

重編國語辭典

Homographs

事半功倍 shìbàn-gōngbèi

Entry Composition

1 事 shì
  1. matter
  2. thing
  3. item
  4. work
  5. affair

classifiers: 件, 樁, 回
2 半 bàn
  1. half
  2. semi-
  3. incomplete
  4. (after a number) and a half
3 功 gōng
  1. meritorious deed or service
  2. achievement
  3. result
  4. service
  5. accomplishment
  6. work (physics)
4 倍 bèi
  1. (two, three etc) -fold
  2. times (multiplier)
  3. double
  4. to increase or multiply