To take a rain​ ​check

Context #1: 

Arias and Varysun are talking on the phone.

​

Arias: Hey Varysun! Can you remind me what time we are going to watch the movie Change of Thrones?

Varysun: Actually, I'm feeling a little sick today.

Arias: Oh, no! What happened?

Varysun: I don't know for sure​,​ but my stomach has been hurting and I've been in bed all day.

Arias: That sounds terrible! Is there anything I can get you?

Varysun: No, thank you, I've just been drinking a lot of 

​water​ and resting.

Arias: I'm glad you are taking care of yourself. 

Varysun: Do you think we could take a rain check on going to the movies?

Arias: Yes! Of course. Once you feel better we can pick another date and time to watch Change of Thrones.

Varysun: Thank you for being so understanding!

Arias: No worries at all, my friend! Feel better and get well soon.

Varysun: Okay, bye now.

Arias: Bye!

Context #2:

Branishk and Ramsayon are cousins who are hanging out at The Rose Garden.

Branishk: I thought you and Sansara were going to Santa Barbara this weekend, no?

Ramsayon: We were but she said she needed to take a rain check.

Branishk: Really? Why? What happened?

Ramsayon: Well, her sister had to have an emergency surgery​,​ so she decided to help​ her this weekend.

Branishk: That's really nice of her. Were you able to get a refund from the hotel?

Ramsayon: We were going to stay at my friend's place, so​ we didn't loose any money. 

Branishk: That's good!

Meaning: To reschedule plans for later

http://languagesystems.edu/