dog eat dog
Definition from Wiktionary, the free dictionary
Alternative forms 
- Ruthlessly acquisitive or competitive. Describes a business or other set of circumstances where people try to succeed at the expense of other people.
- In this company it's dog eat dog. If you don't do better than the rest, you're on the street in next to no time.
- 2007: Zoe Wood, Guardian Unlimited, Nov 11, Tesco has a flutter in Vegas.,
- It is dog eat dog on Las Vegas's world-famous Strip as casino complexes such as MGM Grand and New York New York compete for attention with outlandish gestures like rollercoaster rides and a replica of the Manhattan skyline.