clash / klash/ • n. 1. a violent confrontation: there have been minor clashes with security forces. ∎  an incompatibility leading to disagreement: a personality clash.2. a mismatch of colors. ∎  an inconvenient coincidence of the timing of events or activities: it is hoped that clashes of dates will be avoided.3. a loud jarring sound made by or resembling that made by metal objects being struck together: a clash of cymbals.• v. 1. [intr.] meet and come into violent conflict: protesters demanding self-rule clashed with police. ∎  have a forceful disagreement: Clarke has frequently clashed with his colleagues. ∎  be incompatible or at odds: his thriftiness clashed with Ross's largesse.2. [intr.] (of colors) appear discordant or ugly when placed close to each other. ∎  inconveniently occur at the same time.3. [tr.] strike (cymbals) together, producing a loud discordant sound.DERIVATIVES: clash·er n.

clash sb. XVI. imit.
Also as vb. XVI.