The phrase "arch enemy" refers to a person or group that is the biggest or most powerful opponent one can have. They are like the ultimate enemy or rival. Full definition
Think of fresh juice and alcohol as arch enemies. (presstogether.com)
A self - proclaimed arch enemy of utility companies, he said, he stands determined to show the world how to stretch a dollar, reduce reliance on foreign oil and live the simple life. (treehugger.com)
For the 20 participating artists in «Summer Reading List,» now on view at Arch Enemy Arts in Philadelphia, these books are not only a part of their childhood, but continue to provide their artwork with inspiration. (hifructose.com)