- any voucher or note issued by a store to allow a customer to get a special or sale price later if an item is out of stock
- (idiomatic) any postponement, especially of an offer
- The Sternwoods have money. All it has bought them is a rain cheque. - "The Big Sleep", by Raymond Chandler
- Your son can't make it, he says he'll take a rain cheque. - "Rocky Balboa"