Correct

下劲

/ xià jìn /
Strokes

Example

As a Verb

exert oneself; work hard at; go all out

1
guǒ
如果
shi
míngtiān
明天
kǎoshì
考试
  
,
cái
huì
不会
zhèbān
这般
xiàjìn
下劲
  

He would not go all out if he were not to have an exam tomorrow.

2
gōngzuò
工作
lai
起来
hěn
xiàjìn
下劲
  

He works like a demon.