| Idiom | Meaning | Example | 
| on the throne | 
sitting on the toilet, in the john
 | 
Archie's on the throne. He'll be down in a few minutes.
 | 
| on the tip of my tongue | 
almost able to recall, beginning to remember
 | 
Her name is on the tip of my tongue. It begins with K.
 | 
| on the up and up | 
legal, within the law, not underhanded
 | 
If a company gives away cars, can it be on the up and up?
 | 
| on the verge | 
close, nearly, almost doing it
 | 
Our baby is on the verge of  talking. She said, "Da-da."
 | 
| on the wagon | 
not drinking liquor, not getting drunk
 | 
The old man is on the wagon. He promised he wouldn't drink.
 | 
| on the wane | 
decreasing, diminishing
 | 
The number of men who smoke  is on the wane. It's decreasing.
 | 
| on the whole | 
generally, considering the whole group or situation
 | 
On the whole, women are making progress toward equal status.
 | 
| on the wing | 
flying, in flight
 | 
Canada geese were on the wing, going south for the winter.
 | 
| on the wing | 
without a plan, creating as you go, wing it
 | 
Paul can perform on the wing - he has a great imagination!
 | 
| on thin ice | 
in a risky position, in danger
 | 
His grades are very low in this course. He's on thin ice.
 |