A ticket you can use later; a meeting/date moved to another time.
I had tickets for the game, but it rained. I got a raincheck so I can go another day instead.
Raining Cats and Dogs:
It’s really raining cats and dogs out there today!
Right the Ship:
Correct problems (especially used in Business English).
When she took over as CEO, she had to right the ship.
Rise and Shine:
Rise and shine honey; time to get up for work!
Rocky (A bit rocky):
Difficult, tough, rough.
I always try to make the best of a rocky situation.
Rome Wasn’t Built in a Day:
Some things take a while to work perfectly.
I just started my company, so of course I’m not rich! Rome wasn’t built in a day!
Run out of Steam:
To lose all of your energy.
I ran out of steam, but I only finished with half of my essay.