a violent confrontation

there have been minor clashes with security forces

a mismatch of colours

a clash of tweeds and a striped shirt

a loud jarring sound, as of metal objects being struck together

a clash of cymbals

meet and come into violent conflict

soccer hooligans clashed with rival fans before the match

(of colours) appear discordant or ugly when placed close to each other

the yellow shirt clashed with her purple skirt

strike (cymbals) together, producing a loud discordant sound