| 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. |
| collision course n. A course, as of moving objects or opposing philosophies, that will end in a collision or conflict if left unchanged: two planes on a collision course; dissidents on a collision course with the regime. |