| Idiom | Meaning | Example | 
| ruddy | 
awful, cotton-picking, darn, friggin
 | 
I can't find the ruddy light switch! Ouch! Here it is. Now we can see.
 | 
| ruffle your feathers | 
annoy you, bother you, get your dander up
 | 
Don't let that insult ruffle your feathers. Don't let it upset you.
 | 
| rug up | 
dress warmly, bundle up
 | 
Rug up, my dear. It's winter in Winnipeg!
 | 
| rule of thumb | 
general rule, guideline
 | 
The rule of thumb for a resume is Don't exceed two pages.
 | 
| rule out | 
not allow, not permit, put the kibosh on
 | 
"How about the right to strike?"
"That's been ruled out. They're passing a law against strikes."
 | 
| rumor has it | 
people say that, through the grapevine
 | 
Rumor has it you're moving to Tuktoyaktuk. Is that true?
 | 
| run a red light | 
go through an intersection when the light is red
 | 
The driver of the stolen car ran a red light and hit a truck.
 | 
| run a tab | 
charge your purchases, put it on the bill
 | 
You can run a tab for groceries at my store if you pay every month.
 | 
| run a tub | 
turn on the tap and fill the bathtub with water
 | 
When you're finished your bath, will you run a tub for me?
 | 
| run across | 
discover, happen to see, run into
 | 
While I was in Vancouver, I ran across an old friend of yours.
 |