be on a collision course with somebody

Từ điển Oxford Advanced Learner 8th

be on a colˈlision course (with sb/sth) idiom
1. to be in a situation which is almost certain to cause a disagreement or argument
•I was on a collision course with my boss over the sales figures.
2. to be moving in a direction in which it is likely that you will crash into sb/sth
•A giant iceberg was on a collision course with the ship.
Main entry: ↑collision_idiom