buff

IPA: bˈʌf

Undyed leather from the skin of buffalo or similar animals.
A tool, often one covered with buff leather, used for polishing.
(color) A brownish yellow colour.
A military coat made of buff leather.
(informal) A person who is very interested in a particular subject.
(video games, roleplaying games) An effect that makes a character or item stronger.
(rail transport) Compressive coupler force that occurs during a slack bunched condition.
(colloquial) The bare skin.
The greyish viscid substance constituting the buffy coat.
Any substance used to dilute (street) drugs in order to increase profits.
(obsolete) A buffet; a blow.
(informal) A buffalo, or the meat of a buffalo.
A surname.
(UK, military, mostly in plural) A member of the Buffs (Royal East Kent Regiment).
(UK, slang) A member of the Royal Antediluvian Order of Buffaloes.
(uncommon) Alternative form of buffe (“face armor”) [(historical) A piece of armor covering either the entire face, or the lower face together with a visor that covered the upper face, typically made of multiple lames that could be opened by being lowered (a falling buffe) or raised.]
(slang, US, Air Force) Acronym of big ugly fat fellow (or fucker); US Airforce nickname for the B-52 bomber.
(numismatic slang) Clipping of Buffalo nickel.

To polish and make shiny by rubbing.
(video games, roleplaying games) To make a character or an item stronger.
(medical slang) To modify a medical chart, especially in a dishonest manner.
(graffiti slang) To remove a piece of graffiti by cleaning or removal, especially by a someone who is not a graffiti writer.
To strike.
(dialectal or obsolete) To stammer, stutter

Examples of "buff" in Sentences

The buff is crucial even though they do look kinda ridiculous.
For a train buff without that kind of dough, this is pure torture.
Firstly, it seems odd that an apparent movie buff is not familiar with Cronenberg's work.
But that buff is so big and mean and ugly and hard to stop and vindictive and cruel and surly and ornery.
In Pennsylvania, Tyler Dix, a 16-year-old movie buff, is wide awake by 7 a.m. to cook breakfast for his younger siblings.
But I was lucky -- some of my choices were just hunches (though I've been a word origin buff all my life, which must count for something).
But what really strikes me, as a part-time opera buff, is that this phenomenon makes gearing up for a rock show feel a good deal more like prepping for an opera.
The next thing was to set the village tailor at work upon a coat of that thick strong leather, dressed soft and pliant, which they called buff, to wear under his armour.