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Sense: 1
Date: 1900-2000
Origin: buff 'someone very interested in going to watch fires' (1900-2000), from the buff-colored coats worn by volunteer New York City firefighters in the early 19th century.
Sense: 2
Date: 1700-1800
Origin: buff 'yellow leather made from buffalo skin' (16-18 centuries), from Old French buffle 'wild cattle', from Old Italian bufalo; BUFFALO
Sense: 3
Date: 1800-1900
Origin: buff 'bare skin' (17-19 centuries), from 'leather'; BUFF12

buff

1 noun
     
Related topics: Colours
buff1
1

wine/film/opera etc buff

someone who is interested in wine, films etc and knows a lot about them
2 [uncountable]CC a pale yellow-brown colour [= beige]:
buff envelopes
3

in the buff

old-fashioned not wearing any clothes [= naked]
buff adjective

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