Correct

外快

/ wàikuài /
Strokes

Definition

extra income

Example

As a Noun

extra income/earnings

1
jīngcháng
经常
yòng
利用
业余
shíjiān
时间
gǎo
diǎn
副业
  
,
lāo
diǎn
wàikuài
外快
  

He often does something as a sideline in his spare time for some extra cash/income.

2
Zhēng
  
/
lāo
  
/
zhuàn
wàikuài
外快

make extra money