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English definition of “clash”

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clash

verb uk   /klæʃ/ us  

clash verb (FIGHT)

C2 [I usually + adv/prep] to fight or argue: Students clashed with police after demonstrations at five universities. The government and the opposition parties have clashed over the cuts in defence spending. [I] If two opinions, statements, or qualities clash, they are very different from each other: This latest statement from the White House clashes with important aspects of US foreign policy.

clash verb (COMPETE)

[I] If two people or teams clash in a sports competition or race, they compete seriously against each other.

clash verb (NOT ATTRACTIVE)

C2 [I not continuous] If colours or styles clash, they look ugly or wrong together: I like red and orange together, though lots of people think they clash.

clash verb (HAPPEN TOGETHER)

C2 [I not continuous] UK If two events clash, they happen at the same time in a way that is not convenient: Her party clashes with my brother's wedding, so I won't be able to go.

clash verb (LOUD NOISE)

[I or T] to make a loud noise like metal hitting metal, or to cause something to make this noise: The saucepans clashed as he piled them into the sink. She clashed the cymbals together.

clash

noun uk   /klæʃ/ us  

clash noun (FIGHT)

C2 [C] a fight or argument between people: Rioters hurled rocks and bottles in clashes with police at the weekend. There were violent clashes between the police and demonstrators in the city centre.C2 [C usually singular] a situation in which people's opinions or qualities are very different from and opposed to each other: a clash of opinions/loyalties/personalities
More examples

clash noun (COMPETITION)

[C] a sports competition or race between two people or teams

clash noun (NOT ATTRACTIVE)

[C] the fact of colours or styles looking ugly or wrong together

clash noun (HAPPENING TOGETHER)

[C] UK the situation when two events happen at the same time in a way that is not convenient: In the new timetable, there's a clash between history and physics.

clash noun (LOUD NOISE)

[C] a loud noise that sounds like metal hitting metal: a clash of cymbals
(Definition of clash from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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