(~s)
1.
A ~ occurs when a moving object crashes into something.
They were on their way to the Shropshire Union Canal when their van was involved in a ~ with a car...
I saw a head-on ~ between two aeroplanes.
= crash
N-VAR: oft N with/between n
2.
A ~ of cultures or ideas occurs when two very different cultures or people meet and conflict.
The play represents the ~ of three generations.
= clash
N-COUNT: oft N of/between/with n