rain check
柯林斯词典
1. PHRASE If you say you will take a rain check on an offer or suggestion, you mean that you do not want to accept it now, but you might accept it at another time. 目前无法接受，但可日后接受的邀请或建议
I was planning to ask you in for a brandy, but if you want to take a rain check, that's fine. 我本想请你来喝杯白兰地，但如果你想改日再来，也行。
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rain check
剑桥词典
- 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 .
（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 ticket that allows you to see an event at a later time if bad weather stops that event from happening
（体育比赛因雨改期再赛时）可延期使用的票