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

• この文ぶん房ぼう具ぐは発はつ売ばいから30年ねん経た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.

• ロングセラー商しょう品ひんを育そだてるには品ひん質しつが大たい切せつだ。

  Quality is important for nurturing a product with steady long-term sales.