noun
a person who decides or influences what is considered fashionable or stylish in a particular field or area
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The tastemaker in the fashion industry sets trends that influence the entire market.
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My friend is always the tastemaker when it comes to trying new restaurants in town.
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She's the ultimate tastemaker when it comes to music - everyone follows her playlists.
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As a tastemaker in the art world, her opinion can make or break an artist's career.