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collision course

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noun
  1. a course or path of a vehicle, projectile, etc., that, if unchanged, will lead to a collision with another object.
  2. any plan, attitude, or course of action that leads to a confrontation or conflict with another.
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Origin of collision course

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018