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an opera buff

He's a real film buff.

film buff

an opera/film/computer/wine buff

<he's such a film buff that he owns over 3,000 movies>: the state of being nude <sunbathing in the buff>

She is a big movie buff.

a computer / opera / film buff

a buff envelope

He was spotted on the beach looking extremely buff.

Let's play a game of blind man's buff.