R
(as of Dec 16, 2007)- Rain Check
- Rain or Shine
- Raining Cats and Dogs
- Rat Race

- Red-Letter Day

- Ring a Bell

- Rock the Boat

- Run Off at the Mouth

Sample Idiom
Rain Check
Sentence
The store run out of the computers that were on sale today, so they gave us a
rain check.
Explanation
a piece of paper from a store for buying a sold-out item at the same discounted
price at a later date
Origin
Rain checks were first issued at baseball games in the 1800s, and that's when this
idiom became popular. If the game was rained out, you took your rain check ticket
and used it to get a ticket for a future game at no extra cost.

