Webster's Revised Unabridged Dictionary · 1913

Clash

Clash , intransitive verb

[Of imitative origin; compare German klatschen, Prov. German kleschen, Dutch kletsen, Danish klaske, English clack.]

1.
To make a noise by striking against something; to dash noisily together.
2.
To meet in opposition; to act in a contrary direction; to come onto collision; to interfere.
However some of his interests might clash with those of the chief adjacent colony. — Palfrey

Clash , transitive verb

To strike noisily against or together.

Clash , noun

1.
A loud noise resulting from collision; a noisy collision of bodies; a collision.
The roll of cannon and clash of arms. — Tennyson
2.
Opposition; contradiction; as between differing or contending interests, views, purposes, etc.
Clashes between popes and kings. — Denham