1.
If two or more people or things are on a collision course , there is likely to be a sudden and violent disagreement between them.
The two communities are now on a collision course...
Britain’s universities are set on a collision course with the government.
N-SING : usu on a N , oft N with n
2.
If two or more people or things are on a collision course , they are likely to meet and crash into each other violently.
There is an asteroid on a collision course with the Earth.
N-SING : usu on a N , oft N with n