'life and death enemies'?


How do we call two people who are worst enemies of each other? Life and death enemies?

Thank you very much.

Maybe sworn enemies.
Or bitter enemies.

By the way, your question should start “what do we call…”. It’s quite a common mistake.

“Arch enemy” is probably what you want. There is also “mortal enemy,” but it is literally someone who wants you dead.

Actually I think I knew that phrase (but have forgot it), so I asked. Now I think the phrase I knew is ‘sworn enemies’. But anyway which of the aforementioned phrases is the most common? And what’s the meaning of ‘arch’ in ‘arch enemy’? I find it rather strange… :smiley: