This expression is used when people behave badly or treat someone badly that they are supposed to be friends with.
sworn enemies
to hate someone: "Those two are sworn enemies."
sworn enemies|enemies|swear|sworn
n. phr. People or groups or nations that have a long-standing dislike for each other. The Israelis and the Arabs used to be sworn enemies but hopefully they will sign a lasting peace accord.
An enemies idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with enemies, allowing users to choose the best word for their specific context.
Wörterbuch der ähnlichen Wörter, Verschiedene Wortlaut, Synonyme, Idiome für Idiom enemies