collision course

noun

collision course

noun

1

A course or path between two or more objects which, if continued at the current rate, will result in a collision.

The two boats were on a collision course, so they both veered starboard.
Now that everyone’s on the same continent, more or less, and everyone’s on collision courses, an episode can more naturally flow back and forth.2017 July 23, Brandon Nowalk, “The great game begins with a bang on Game Of Thrones (newbies)”, in The Onion AV Club:

Derived terms: on a collision course

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.