Focus on the pronunciation of top-selling
English definition of “top-selling”
top-selling (also top selling)
adjective [before noun] COMMERCE
› extremely popular and selling in larger quantities than other brands: a top-selling brand/product/model They manufacture three of the world's ten top-selling drugs. She has her own TV show and two top-selling albums.
› producing books, songs, etc. that are extremely popular and sell in larger quanitites than others: She's one of our top-selling authors.