| Idiom | Meaning | Example |
| on a roll |
having good luck, lucky streak
|
I'm gonna play bingo all night. I'm lucky - I'm on a roll!
|
| on a silver platter |
like a beautiful gift, served in style
|
Success won't come on a silver platter. You have to work for it.
|
| on a string |
controlled by a person, wrapped around his finger
|
He's got you on a string, Bonny. Are you thinking for yourself?
|
| on about |
(See go on about)
|
|
| on all fours |
on your hands and knees, crawling around
|
There was Julie, on all fours, looking for her contact lens.
|
| on an empty stomach |
without food in your stomach, on a full stomach
|
He never has a drink on an empty stomach. He says it affects
his appetite.
|
| on approval |
taking a purchase home to decide if you want it
|
I buy clothes on approval so I can return them if they don't fit.
|
| on behalf of |
representing a group, acting for a group
|
He presented the award to me on behalf of the community club.
|
| on board |
loaded on a vehicle, riding on a boat etc.
|
Two thousand passengers were on board the ship to Canada.
|
| on cloud nine |
very happy, riding high
|
When Bev received her diploma, she was on cloud nine.
|