Correct

同行是冤家

/ tóng háng shì yuān jiā /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/同行是冤家-Chinese-idioms-Cchatty-c8097982-dacd-4c9c-91fe-f8a72ff8fb42-1612776692.jpg

Collocation

1
同行是冤家的旧观念
2
同行不是兔家
3
同行必定是冤家
4
同行未必是冤家

Definition

同行是冤家

Literally means:

people of the same trade are enemies

Actually means:

two of trade can never agree

In the past, it means that people of the same trade were jealous of each other due to interest conflicts, and thus become hostile to each other.

Now such hostility has been somewhat eased, but is still exists. Derogatry.

旧时指从事同一行业的人因为利害冲突,互相嫉恨,彼此成了仇家。

现今这种情况虽然有贬义色彩。

Example

Used as a minor sentence, or as object or attributive. It can have other words in between. (作小句、宾语、定语,中间可插入别的词语)
1
Zhāng
jīng
经理
shuō
  
,
jiā
大家
yào
不要
zài
rènwéi
认为
tóngháng
同行
shì
yuānjia
冤家
  
,
ér
yīnggāi
应该
tóngháng
同行
kàn
chéng
jiā
一家
rén
  
,
lián
联合
lai
起来
  

Zhang said, we should stop think of peers as friends, but should see peers as a family, united.

2
háishi
还是
bào
zhāo
tóngháng
同行
shì
yuānjia
冤家
de
lǎo
guānniàn
观念
  
,
xīn
一心一意
xiǎng
kuǎ
挤垮
tóngháng
同行
  
,
自己
独霸
zhěng
整个
háng
行业
  

He is still clinging to the old idea that peers are friends, single-heartedly trying to crush peers, their own dominance of the entire industry.

3
Tóngháng
同行
wèi
未必
shì
yuānjia
冤家
  
Tóngháng
同行
de
jìngzhēng
竞争
yǒu
yōushèngliètài
优胜劣汰
de
zuòyòng
作用
  
,
zuìzhōng
最终
jiāng
jìn
促进
háng
行业
de
zhǎn
发展
  

Peers are not necessarily friends. Peer competition has the role of the fittest, and will eventually promote the development of the industry.