dog-eat-dog
adjective uk/ˌdɒɡ.iːtˈdɒɡ/ us/ˌdɑː.ɡ.iːtˈdɑː.ɡ/
狗咬狗的；损人利己的；无情的
used to describe a situation in which people will do anything to be successful, even if what they do harms other people
It's a dog-eat-dog world out there. 这是一个损人利己的无情世界。