Correct

当面一套,背后一套

/ dāng miàn yī tào bèi hòu yī tào /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/当面一套背后一套-Chinese-idioms-Cchatty-718d0adb-2bae-4144-afb1-79697ad7857a-1612777048.jpg

Collocation

1
当面一套,背后一套伪君子
2
当面一套,背后一套的两面派
3
不可以当面一套,背后一套
4
总是当面一套,背后一套
5
千万别当面一套,背后一套

Definition

当面一套,背后一套

Literally means:

act one way to your face and another behind your back

Actually means:

It means acting one way to one's face and another behind his back. It is often used to indicate that what one says is widely different from what he does, i.e. he is double-dealing. Derogatory.

指当着人家的面搞一套,背着人家搞另外一套。常用来形容一个人说的和做的完全不一样,搞两面派。具有贬义色彩。

Example

Used as predicate, attributive or object. (作谓语、定语、宾语)
1
de
shì
men
你们
qiānwàn
千万
biè
dāngmiàn
当面
tào
  
,
bèihòu
背后
tào
  
,
ying
答应
bāngmáng
帮忙
què
tuō
zhāo
bàn
  
,
huì
dānwu
耽误
de
shì
de
  

His business you must not face a set, behind a set, promised to help but drag on, will delay his business.

2
suīrán
虽然
quēdiǎn
缺点
tǐng
duō
  
,
dàn
chéngshí
诚实
shuǎngkuai
爽快
  
,
jué
绝不
shì
zhǒng
那种
dāngmiàn
当面
tào
  
,
bèihòu
背后
tào
de
wěijūn
伪君子
  

Although he has many shortcomings, but honest and cheerful, is by no means the kind of face-to-face set, behind a set of hypocrites.

3
guǎn
不管
duì
shàng
上级
huò
duì
lǎobǎixìng
老百姓
  
,
dōu
可以
dāngmiàn
当面
tào
  
,
bèihòu
背后
tào
  
,
biǎo
表里不一
huì
shī
失去
rénxīn
人心
  

No matter to the superiors or to the common people, can not face a set, behind a set, the table will not lose heart.