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English definition of “muff”

muff

noun [C] uk   /mʌf/ us  
a short tube of fur or warm cloth, into which women in the past put their hands in cold weather in order to keep them warm

muff

verb [T] uk   /mʌf/ informal us  
to spoil an opportunity or do something badly: I only had two lines in the whole play and I muffed them.
(Definition of muff from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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