Real Dictionary

buff
colour: Something that is buff is pale brown in colour.

buff in American English 1
a heavy, soft, brownish-yellow leather made from the skin of the buffalo or from other animal hides
adjective: having the color of buff
noun: a soft, thick, light-yellow leather with a napped surface, originally made from buffalo skin but later also from other skins, used for making belts, pouches, etc.
transitive verb: to clean or polish (metal) or give a grainless finish of high luster to (plated surfaces) with or as if with a buff stick or buff wheel

buff in American English 2
a blow
noun: a blow; slap
transitive verb: to reduce or deaden the force of; act as a buffer

buff in American English 3
noun: plate armor for the lower part of the face and the throat, used with a burgonet; buffe

buff in British English 1
adjective: fit; attractive
noun: a soft thick flexible undyed leather made chiefly from the skins of buffalo, oxen, and elk
verb: to clean or polish (a metal, floor, shoes, etc) with a buff

buff in British English 2
noun: a blow or buffet (now only in the phrase blind man's buff)
verb: to deaden the force of

buff in British English 3
noun: an expert on or devotee of a given subject