HSK V7-9
Correct

马后炮

/ mǎhòupào / 
Strokes

Definition

lit. firing after the horse/fig. belated action/giving advice in hindsight

Example

As a Noun

belated action or advice; second guess

1
Tā
他
shì
是
gè
个
mǎhòupào
马后炮
  
。

He is always a second-guesser.

2
Kǎoshì
考试
dōu
都
wán
完
le
了
  
,
nǐ
你
cái
才
shuō
说
bāng
帮
wǒ
我
fùxí
复习
gōngkè
功课
  
,
zhè
这
qǐ
岂
bù
不
shì
是
mǎhòupào
马后炮
ma
吗
  
?

You come and offer to help with my lessons only after the examination. Isn't that a bit too late?

3
Fàngmǎhòupào
放马后炮

be a Monday morning quarterback; make an I-told-you-so remark; second-guess