Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: From the sound of sharp blows

clash

1 verb
     
clash1
1 [intransitive] if two armies, groups etc clash, they start fighting - used in news reports:
Troops clashed near the border.
clash with
Police have clashed with demonstrators again today.
2 [intransitive] if two people or groups clash, they argue because they have very different beliefs and opinions - used in news reports
clash with
Democrats clashed with Republicans in a heated debate.
clash over/on
The two men have clashed over the report's conclusions.
3 [intransitive] if two colours or designs clash, they look very bad together
clash with
I can't wear red - it clashes with my hair.
4 [intransitive] especially British English if two events clash, they happen at the same time in a way that is inconvenient [= conflict American English]
clash with
The announcement has been delayed to avoid clashing with the Prime Minister's speech.
5 [intransitive and transitive] if two pieces of metal clash, or if you clash them, they make a loud ringing sound:
The cymbals clashed.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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