1to sell well; to be in strong demand (of a product or work)
この本は発売一週間でよく売れて、増刷が決まった。
This book sold so well in its first week that a reprint was decided.
この店のアイスは夏になると飛ぶように売れる。
This shop's ice cream sells like hotcakes once summer comes.
値段を下げたら急に商品が売れ始めた。
Once we lowered the price, the product suddenly started selling.
安くて質が良ければ、どんな商品でも売れる可能性がある。
If it's cheap and good quality, any product has a chance of selling well.
2to become well known or popular; to gain wide recognition (often said of a performer, artist, or their work)
彼は主演映画がヒットしてから急に売れるようになった。
He suddenly became popular after the film he starred in became a hit.
あの新人漫画家は今、業界で一番売れている。
That new manga artist is currently the most popular one in the industry.
新曲がヒットして、バンドは全国的に売れっ子になった。
Their new song was a hit and the band became a nationwide sensation.