rain check
noun [ C ] US uk/ˈreɪn ˌtʃek/ us/ˈreɪn ˌtʃek/
（商店因促销商品无库存而发给顾客、允许日后以相同优惠价购买的）购物优惠券
a piece of paper that you are given by a shop when something that is advertised for sale at a certain price is not available. This piece of paper allows you to buy the product at the advertised price when it becomes available.
（体育比赛因雨改期再赛时）可延期使用的票
a ticket that allows you to see an event at a later time if bad weather stops that event from happening
Idiom
take a rain check (on something)idiom informal （用于婉拒邀请）下次吧，以后再说，以后再叨扰
used to tell someone that you cannot accept an invitation now, but would like to do so at a later time
Mind if I take a rain check on that drink? I have to work late tonight. 这杯酒你改天再请我喝好不好？今晚我得加班工作。