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English definition of “fur”

fur

verb [I]     /fɜːr/ US  /fɝː/ (-rr-)
If water pipes , kettles , etc. fur, a hard grey substance forms on the inside: Over the years , the pipes in our house have slowly furred (up).Covering and adding layers (also fur up) If someone's arteries (= tubes that carry blood from your heart ) fur, or something furs them, they become slightly blocked : Eating too much fat furs up your arteries which slows down the flow of blood .Closing and blockingDisorders and diseases of the heart and blood
(Definition of fur verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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