1. sound of objects banging together; confrontation, conflict. make a loud banging sound; bang together; strongly disagree, confront. clashclash , v. i. [imp. & p. p. clashed ; p. pr. & vb. n. clashing.] [of imitative origin; cf. g. klatschen, prov. g. kleschen, d. kletsen, dan. klaske, e. clack.]