Crash into one another (7)
I believe the answer is:
collide
(Other definitions for collide that I've seen before include "Dash together; clash" , "Smash together" , "Hit" , "Run into" , "Come into conflict" .)
I believe the answer is:
collide
(Other definitions for collide that I've seen before include "Dash together; clash" , "Smash together" , "Hit" , "Run into" , "Come into conflict" .)