Meaning of “be on a collision course” in the English Dictionary

british dictionary

"be on a collision course" in British English

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be on a collision course

If two or more people or groups are on a collision course, they are doing or saying things that are certain to cause a serious disagreement or fight between them:

All attempts at diplomacy have broken down and the two states now appear to be on a collision course.

(Definition of “be on a collision course” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)