Correct

偷听

/ tōutīng / 
Strokes

Definition

to eavesdrop/to monitor (secretly)

Example

As a Verb

eavesdrop; listen in on/to

1
Tā
她
zài
在
ménwài
门外
tōutīng
偷听
  
。

She was eavesdropping outside the door.

2
Tōutīng
偷听
sīfánghuà
私房话

eavesdrop on a private conversation; listen in on a private conversation