From WordNet (r) 3.0 (2006):
clash
n 1: a loud resonant repeating noise; "he could hear the clang
of distant bells" [syn: clang, clangor, clangour,
clangoring, clank, clash, crash]
2: a state of conflict between persons [syn: clash,
friction]
3: a state of conflict between colors; "her dress was a
disturbing clash of colors"
4: a minor short-term fight [syn: brush, clash, encounter,
skirmish]
v 1: crash together with violent impact; "The cars collided";
"Two meteors clashed" [syn: collide, clash]
2: be incompatible; be or come into conflict; "These colors
clash" [syn: clash, jar, collide]
3: disagree violently; "We clashed over the new farm policies"