The phrase "dog-eat-dog" describes a merciless, cutthroat, and opportunistic world where everyone is willing to do whatever it takes to get ahead, regardless of the consequences. Synonyms for this phrase include vicious, brutal, ruthless, and competitive. Other similar expressions that convey the same idea are "every man for himself," "survival of the fittest," and "the law of the jungle." In such a world, character and ethics often take a back seat to ambition and achievement, and the strong prey on the weak. However, it is important to remember that there are still people who value kindness, cooperation, and community over personal gain, making the world a better place.