| Idiom | Meaning | Example | 
| root of the problem | 
(See the root of the problem)
 | 
 | 
| rope into | 
be asked to help, talk into  helping
 | 
We got roped into delivering posters because we have a car.
 | 
| rot gut | 
homemade liquor, hooch,  moonshine
 | 
If you drink that rot gut, you'll get sick. It tastes awful!
 | 
| rotten to the core | 
all bad, corrupt
 | 
Hitler's regime was rotten to the core - corrupt.
 | 
| rotter | 
one who cheats or lies, dirty rat
 | 
Hank, you rotter! You sold me a car that won't start.
 | 
| rough and ready | 
strong and willing, a game one
 | 
For the oil-well crews, we need  people who are rough and ready.
 | 
| rough going | 
difficult work, tough sledding
 | 
It was rough going the first year. We had financial problems.
 | 
| rough up | 
beat a little bit, push and slap
 | 
The leader roughed me up a bit because I lied to him.
 | 
| round the clock | 
(See around the clock)
 | 
 | 
| round up | 
bring together, chase into a herd
 | 
Will you round up the kids and tell them to come inside?
 |