| Idiom | Meaning | Example |
| on deck |
next in order, next to bat
|
Gary's at bat; Tim's on deck.
|
| on drugs |
using drugs, do drugs
|
"Do you know he's on drugs?" "Yes. His eyes look blank."
|
| on edge |
not relaxed, nervous, anxious, edgy
|
Gina's a little on edge. She gets her test results back today.
|
| on even terms |
having equal skills, having the same ability
|
When we play chess, we're on even terms. We're both average.
|
| on fire |
eager, energetic, all fired up, gung ho
|
When he began working here, he was on fire - very enthusiastic.
|
| on good terms |
in a good relationship, able to talk and work with
|
Steve is on good terms with all his co-workers. They like him.
|
| on his last legs |
very tired or old, at the end of his career
|
Gordie was on his last legs, but he could still shoot hard.
|
| on his tail |
following him closely, chasing him
|
The thief knew the police would follow him. They'd be on his tail.
|
| on in years |
(See get on in years)
|
|
| on loan |
borrowed, signed out
|
The book you want is on loan to someone else until May 12.
|