Raincheck
Raincheck, also written as rain check or rain-check, is a term used to refer to a promise or arrangement to postpone participation in an event or activity to a later time. It originated in American baseball in the 19th century, where a postponed or rained-out game left ticket holders with a voucher—often called a rain check—that could be redeemed for admission to a future game. Over time, the phrase broadened beyond sports to ordinary social invitations and commercial contexts.
As an idiom, take a rain check means to decline an invitation or offer at the moment
In retail and promotions, a rain check refers to a policy or certificate that allows a customer
Variations in spelling exist, with occasional hyphenation such as rain-check, though the two-word form rain check