Fr.: se heurter, heurter, entrer en collision
1) To strike together with forceful impact, such as two astronomical objects.
From L. collidere "to strike together," from col- variant of → com- "together" + laedere "to strike," of unknown origin.
Ham- "together, with," → com- + kubidan, kuftan "to beat, strike, pound," kus "drum," Mid.Pers. kôftan and kôstan "to beat, strike."
A particle accelerator in which two beams of particles are forced to collide head on.