Dog-Eat-Dog ( people are looking out for their own interests ... )
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Dog-eat-dog describes a world in which people fight for themselves only and will hurt other people. Example: "I have been in this business for twenty years. It's dog-eat-dog. The competition is always trying to steal your customers."
Dog-eat-dog means that a person is like a dog that will eat another dog. Sometimes people say, "It's a dog-eat-dog world", as an excuse when they have hurt another person. Example: "I can't believe you sold him your motorcycle for so much money!" Reply: "Hey, it's a dog-eat-dog world."
It's a dog-eat-dog world means that you must first watch out for your own interests, because other people will be watching out for theirs.
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