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English definition of “be on a collision course”

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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 Learners Dictionary & Thesaurus © Cambridge University Press)
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