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English definition of “buff”

buff

noun [C] uk   /bʌf/ informal us  
a person who knows a lot about and is very interested in a particular subject: a computer/opera/film buff

buff

adjective uk   /bʌf/ us  

buff adjective (COLOUR)

(of) a pale, yellowish-brown colour: a buff envelope

buff adjective (HEALTHY)

If a man is buff, he has a body that is a good shape, and looks as if he has done a lot of exercise: He was spotted on the beach looking extremely buff.

buff

verb [T] uk   /bʌf/ us  
to rub an object made of metal, wood, or leather in order to make it shine, using a soft, dry cloth
(Definition of buff from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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