"Take a rain check" is an informal way of declining an invitation with the intention of accepting it at a later time. Other ways to phrase the same idea include "I'll have to pass this time," "I'll catch you next time," or simply "I can't make it, but let's reschedule." Other synonyms that convey the same meaning include "postpone," "defer," "delay," "put off," "reschedule," or "rearrange." The phrase "rain check" has its origins in baseball, where a rain check allowed fans to attend a future game if the current game was rained out. Today, the phrase is commonly used in everyday conversations.