Comprehensive resource for understanding and mastering English idioms
The idiom "collision course" refers to a situation in which two or more things are moving towards each other, or where two ideas or events are coming together in a head-on manner. It can also mean a situation that is likely to lead to conflict or disagreement. The figurative or metaphorical meaning of "collision course" is often used to describe a situation where two groups or individuals have opposing views or objectives, and are on a path towards confrontation. It can also be used to describe a situation where two events or circumstances are likely to clash or interfere with each other in some way.
The idiom "collision course" dates back to at least the 16th century, where it was first used in the context of physics and astronomy. It comes from the idea of two objects moving towards each other with a combination of speed and direction that is likely to result in a collision or crash. Over time, the idiom has come to be used in a more figurative sense to describe situations where two groups or individuals are on a path towards conflict or disagreement.