落空

làokōng
to fail to achieve something; to be fruitless

CEDICT

Homographs

落空 làkòng
  1. to omit; to neglect (to do sth)
  2. to miss a chance; to let an opportunity slip by
落空 luòkōng to fail; to fall through; to come to nothing

Entry Composition

1 落 lào colloquial reading for 落 luò in certain compounds
2 空 kōng
  1. empty
  2. air
  3. sky
  4. in vain