Correct

第三者

/ dì sān zhě /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/第三者-Chinese-idioms-Cchatty-44eb0cec-03e6-4fc1-9f44-2332f58e40a8-1612777911.jpg

Collocation

1
第三者的口气
2
充当第三者的角色
3
谴责第三者
4
破坏别人婚姻的第三者

Definition

第三者

Literally means:

the third person

Actually means:

It literally refers to a third party (an individual or a group) apart from the two parties involved. It is particularly used to refer to a person who has an affair with married person or a person who is in love with one of the two lovers. Derogatory.

双方当事人以外的第三方(个人或团体)。专指和别人的丈夫或妻子发生婚外恋情的人,或和某对恋人当中的一方发生感情纠葛的人。具有贬义色彩。

Example

Used as object, subject or attributive. (作宾语、主语、定语)
1
Wèile
为了
miǎn
避免
zhèngmiàn
正面
de
chōng
冲突
  
,
chángyòng
常用
sānzhě
第三者
de
kǒuwěn
口吻
lái
píng
批评
biéren
别人
  

In order to avoid a head-on conflict, he often criticizes others in the tone of a third party.

2
huài
破坏
biéren
别人
jiātíng
家庭
de
sānzhě
第三者
  
,
kěndìng
肯定
huì
shòudào
受到
shèhuì
社会
de
qiǎn
谴责
de
  

Third parties who destroy other people's families will certainly be condemned by society.

3
men
他们
hūn
离婚
shì
yīnwèi
因为
sānzhě
第三者
de
chā
插足
  
,
zhàngfu
丈夫
zài
wàimiàn
外面
yǒu
le
qíngrén
情人
  

They divorced because the third party stepped in, i.e. the husband had a lover outside.