1. (n.) The act of striking together\; a striking together, as of two hard bodies; a violent meeting, as of railroad trains; a clashing.

2. (n.) A state of opposition; antagonism; interference.

accident antagonism antipathy antithesis appulse backlash bad blood belligerence blow brunt bulldozing bulling bump calamity cannon carambole carom casualty cataclysm catastrophe clash clashing competition concussion conflict confrontation confutation contention contradiction contradistinction contraindication contraposition contrariety contrariness contrast contretemps counteraction counterposition counterworking crack-up crankiness crash cross-purposes crotchetiness crump crunch demolishment despitefulness destruction dilapidation disaccord disagreement disaster discrepancy dissension dissent encounter enmity fractiousness friction grief hammering hate hatred hostility ill hap impact impingement inconsistency inimicalness interference jar jolt kick malevolence malice malignity mauling meeting misadventure mischance misfortune mishap nasty blow near-miss negativeness nonconformity noncooperation obstinacy onslaught oppositeness opposition opposure oppugnance oppugnancy percussion perverseness perversity pileup polarity quarrelsomeness ramming reaction recalcitrance recoil refractoriness renitency repercussion repugnance resistance revolt rivalry ruin shipwreck shock showdown sideswipe sledgehammering smash smash-up smashing smashup spite spitefulness staggering blow swimming upstream thrusting tragedy uncooperativeness vying whomp wreck