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1. Sharply and harshly discordant
   "clashing interests of loggers and conservationists"; "clashing colours"
    
2. In a dispute or confrontation
   - at loggerheads, at outs [N. Amer], at odds

1. Crash together with violent impact
   "Two meteors clashed";
   - collide
    
2. Be incompatible; be or come into conflict
   "These colours clash";
   - jar, collide
    
3. Disagree violently
   "We clashed over the new farm policies"

See also: hostile, incompatible

Type of: collide with, conflict, differ, disagree, dissent, hit, impact, impinge on, run into, strike, take issue

Encyclopedia: Clash, The