Correct

露马脚

/ lòu mǎ jiǎo / 
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/露马脚-Chinese-idioms-Cchatty-cff70560-e5a9-4a01-9050-843a71422a43-1612778399.jpg

Collocation

1
要露马脚
2
会怕露马脚
3
露了马脚
4
露出马脚

Definition

露马脚

Literally means:

show the horse foot

Actually means:

It figuratively means revealing something that one does not want others to know. Derogatory.

比喻暴露出不想让人家知道的真相。具有贬义色彩。

Example

Often used as predicate or object, and can have other words in between. (常作谓语、宾语,中间可以插入别的词语)
1
Zhège
这个
màopái
冒牌
dàxuéshēng
大学生
jìngrán
竟然
xiǎng
想
xíngpiàn
行骗
  
,
dàn
但
hěnkuài
很快
jiù
就
lù
露
le
了
mǎjiǎo
马脚
  
,
yīnwèi
因为
tā
他
duì
对
dāngdì
当地
de
的
qíngkuàng
情况
yīwúsuǒzhī
一无所知
  
。

The fake college student tried to cheat, but soon showed his feet because he knew nothing about the local situation.

2
Zhè
这
jiāhuo
家伙
yī
一
yòng
用
yīngyǔ
英语
jiāotán
交谈
jiù
就
mǎshàng
马上
lòumǎjiǎo
露马脚
  
,
tā
他
de
的
duìhuà
对话
zhōng
中
méiyǒu
没有
yī
一
gōu
句
wánzhěng
完整
de
的
yīngyǔ
英语
  
。

As soon as this guy talks in English, he's got his feet on his feet, and there's not a complete English word in his conversation.

3
Liǎng
两
míng
名
nánzǐ
男子
tōu
偷
le
了
péngyou
朋友
de
的
dōngxī
东西
hòupà
后怕
lòumǎjiǎo
露马脚
  
,
jiù
就
hé
和
péngyou
朋友
yīqǐ
一起
qù
去
bàoàn
报案
  
,
dàn
但
zài
在
jǐngchá
警察
de
的
fǎnfù
反复
xúnwèn
询问
xià
下
  
,
zuìzhōng
最终
háishi
还是
lù
露
le
了
mǎjiǎo
马脚
  
。

Two men stole a friend's things, afraid of the horse's feet, and friends went to report the case, but after repeated questioning by the police, the horse's foot was finally exposed.