1 N-COUNT (食品的)最迟销售日期,保质期 The sell-by date on a food container is the date by which the food should be sold or eaten before it starts to decay. (食品的)最迟销售日期,保质期 [British]
in AM, use 美国英语用 expiration date
2 PHRASE 不再有效的;不再吸引人的;无用的 If you say that someone or something is past their sell-by date, you mean they are no longer effective, interesting, or useful. 不再有效的;不再吸引人的;无用的 [British, disapproval]