• the sell-by date of a food product is a date marked on the package. the food must be sold by that date to make sure that it will still be fresh and safe to eat when it is bought.
someone or something that is past their sell-by date is old, and no longer interesting, important, or relevant; an informal expression.
someone or something that is past their sell-by date is old, and no longer interesting, important, or relevant; an informal expression.