Clash, v. i. [imp. & p. p. Clashed; p. pr. & vb. n. Clashing.]
Etymology: [Of imitative origin; cf. G. klatschen, Prov. G. kleschen, D. kletsen, Dan. klaske, E. 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.
2 other Webster entries under this spelling
Clash, v. t.
To strike noisily against or together.
Clash n.
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.
Shades of meaning
Fernald has no entry of its own for clash; he lists it under collision.
He lists it without comment; the entries above explain its neighbors.