ˈrain check noun

1. take a rain check (on something) informal especially American English used to say that you will do something in the future but not now:
‘Care for a drink?’ ‘I’ll take a rain check, thanks.’

2. [countable] American English a ticket for an outdoor event, such as a sports game, that you can use again if it rains and the action stops

[TahlilGaran] Dictionary of Contemporary English ▲

rain check
a promise to repeat an invitation at a later date
I decided to take a rain check and will go to the restaurant with my friend another time.

[TahlilGaran] English Idioms Dictionary ▲

rain check
n.
1. A special free ticket to another game or show which will be given in place of one canceled because of rain.
When the drizzle turned into a heavy rain the manager announced that the baseball game would be replayed the next day. He told the crowd that they would be given rain checks for tomorrow's game as they went out through the gates.
2. informal A promise to repeat an invitation at a later time.
Bob said, "I'm sorry you can't come to dinner this evening, Dave. I'll give you a rain check."

[TahlilGaran] English Idioms Dictionary ▲