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English definition of “ruin”

ruin

verb [T] uk   /ˈruː.ɪn/ us  
B2 to spoil or destroy something severely or completely: Huge modern hotels have ruined this once unspoilt coastline. Her injury ruined her chances of winning the race. to cause a person or company to lose all their money or their reputation: Cheap imported goods are ruining many businesses. If there's a scandal I'll be ruined!

ruin

noun uk   /ˈruː.ɪn/ us  
[U] the process or state of being spoiled or destroyed: The car accident meant the ruin of all her hopes. They let the palace fall into ruin. C2 [U] a situation in which a person or company has lost all their money or their reputation: Many companies are on the edge/brink/verge of ruin. Alcohol was my ruin (= the thing that spoiled my life) B1 [C] the broken parts that are left from an old building or town: We visited a Roman ruin. the ruins of the ancient city of Carthage be/lie in ruins (of a building or city) to be extremely badly damaged so that most of it has fallen down: The town lay in ruins after years of bombing. C1 to be in an extremely bad state: The economy was in ruins after the war.
(Definition of ruin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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