v. i. - To make a noise by striking against something; to dash noisily together.
v. i. - To meet in opposition; to act in a contrary direction; to come onto collision; to interfere.
v. t. - To strike noisily against or together.
n. - A loud noise resulting from collision; a noisy collision of bodies; a collision.
n. - Opposition; contradiction; as between differing or contending interests, views, purposes, etc.