Correct

噔

/ dēng / 
Strokes

Definition

(onom.) thud/thump

Example

As an Onomatope

thump; thud

1
Tā
他
dēngdēng
噔噔
dēng
噔
deshàng
地上
le
了
lóu
楼
  
。

He thumped upstairs.

2
Dēngdēng
噔噔
dēng
噔
de
的
jiǎobùshēng
脚步声

sound of heavy footsteps