I. | ̷ ̷ˌ ̷ ̷ˈ ̷ ̷ adjective
: marked by ruthless self-interest
a dog-eat-dog business from start to finish, with each side playing a fast and underhanded game — F.B.Gipson
II. noun
: ruthless self-interest
a raw tough city where dog-eat-dog was the law — New Republic