立竿见影

立竿見影
lìgānjiànyǐng
  1. lit. set up a pole and immediately see its shadow (idiom)
  2. fig. to get instant results

CEDICT

producing instant results; having immediate effect

Wiktionary

竖竿于阳光下，可立见其影。比喻迅速收到成效。

重編國語辭典

Entry Composition

1 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
2 竿 gān pole
3 见 jiàn
  1. to see
  2. to meet
  3. to appear (to be sth)
  4. to interview
  5. opinion
  6. view
4 影 yǐng
  1. picture
  2. image
  3. film
  4. movie
  5. photograph
  6. reflection
  7. shadow
  8. trace