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dog eat dog
Characterized by ruthless behavior and competition, as of a society, situation, industry, etc. Hyphenated if used before a noun. It's dog eat dog right now at school because all the top students are competing to be valedictorian. Don't expect this kind of consideration in the real world—it's dog eat dog out there. Just be careful—it's a dog-eat-dog industry, so everyone will only be looking out for themselves.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
A dog-eat-dog situation is one in which people are willing to harm each other or to use dishonest methods in order to achieve what they want. Office politics can be a dog-eat-dog world. The TV business today is a dog-eat-dog business.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
mod. cruel; highly competitive. This is a dog-eat-dog world.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.