1 noun COMM on packagingspriocdháta díolait's past its sell-by datetá a spriocdháta díola caite2 noun of person, style, etche's almost reached his sell-by date as a player tá a ré mar imreoir beagnach thart, tá a sheal mar imreoir chóir a bheith istighthis approach is past its sell-by datetá ré an chur chuige seo caite