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English definition of “collision”

collision

noun [C or U]     /kəˈlɪʒən/
INSURANCE an accident in which two vehicles hit each other: Injuries from rear-end collisions were down, which could mean more than $45 million saved on accident damage per year. collision damage
be on a collision course if two or more people or groups are on a collision course, they are doing or saying things which will cause a disagreement or problems between them: The House and the Senate are again on a collision course over transportation.
(Definition of collision noun from the Cambridge Business English Dictionary © Cambridge University Press)
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