noun
Refers to physical collisions or figurative clashes of opinions, personalities, or interests. Often implies a mutual, head-on impact.
会議で意見のぶつかり合いがあった。
There was a clash of opinions at the meeting.
車同士のぶつかり合いで渋滞が起きた。
A collision between cars caused a traffic jam.
衝突 is a more formal and technical term for collision or conflict, while ぶつかり合い is more vivid and colloquial, emphasizing the mutual action of hitting each other.
Compound of verb ぶつかる (to collide) in its continuative form ぶつかり and noun 合い (mutual action).