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| Date: | 1500-1600 |
| Origin: | From the sound of sharp blows |
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clash1
1 [intransitive] if two armies, groups etc clash, they start fighting - used in news reports : 
Troops clashed near the border.
Troops clashed near the border.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.
Democrats clashed with Republicans in a heated debate.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.
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.
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.
The cymbals clashed.