Question

You need to back off, or the situation could turn ugly.

Accepted Answer

(idiomatichttps://en.wiktionary.org/wiki/Appendix:Glossary#idiomatic) To become less aggressivehttps://en.wiktionary.org/wiki/aggressive, particularly when one had appeared committed to act.

Sentence	You need to back off, or the situation could turn ugly.
Definition	( idiomatic https://en.wiktionary.org/wiki/Appendix:Glossary#idiomatic ) To become less aggressive https://en.wiktionary.org/wiki/aggressive , particularly when one had appeared committed to act.

Back Situation Turn Ugly Appeared Committed Act