very successful or famous in a particular activity or place.
Iced tea is big in the summertime.The band is still unknown in the US but they're very big in Japan.
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big in (something or somewhere)
Well-known, influential, and/or successful in a particular arena or place. He's very big in the financial sector, so I'm surprised you haven't heard of him.Why are heavy metal bands so big in Scandinavia?