Take a rain check
Meaning
Postpone politely with hope of later fulfillment.
Usage
Used when declining invitations gracefully.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Sporting events issuing vouchers when games rained out.
Used widely in North America since the 19th century.