also: ロング・セラー
noun
longtime best seller; product with steady long-term sales
Wasei-eigo from 'long seller'. Refers to a product that continues to sell well over many years, not just a one-time hit.
wasei-eigo (Japanese-coined English), from long seller
この文房具は発売から30年経ってもロングセラーだ。
This stationery item has been a longtime best seller even 30 years after its release.
ロングセラー商品
Quality is important for nurturing a product with steady long-term sales.