a case of dog eat dog

Từ điển Oxford Advanced Learner 8th

(a case of) ˌdog eat ˈdog idiom
a situation in business, politics, etc. where there is a lot of competition and people are willing to harm each other in order to succeed
•I'm afraid in this line of work it's a case of dog eat dog.
•We're operating in a dog-eat-dog world.
Main entry: ↑dog_idiom