叮咚

dīngdōng
  1. (onom.) ding dong
  2. jingling of bells
  3. clanking sound

CEDICT

onomatopoeic

Entry Composition

1 叮 dīng
  1. to sting or bite (of mosquito, bee etc)
  2. to say repeatedly
  3. to urge insistently
  4. to ask repeatedly
  5. to stick to a point
  6. (onom.) tinkling or jingling sound
2 咚 dōng
  1. (onom.) boom (of a drum)
  2. knock (on the door)