Correct

应声

/ yìngshēng /
Strokes

Definition

an answering voice/to answer a voice/to respond/to copy a voice/to parrot

Example

As a Verb

answer; reply; respond

1
qiāomén
敲门
qiāo
le
hěn
cháng
shíjiān
时间
  
,
dàn
méi
rén
yìngshēngr  
应声儿
  

I've been knocking away for ages, but nobody has answered the door.

Related

应声虫