| Idiom | Meaning | Example | 
| on parade | 
walking in a parade, displaying
 | 
When Jack's on parade, he  marches straight and tall.
 | 
| on parole | 
still supervised, not free of prison
 | 
He's on parole now. He can leave the prison during the day.
 | 
| on pins and needles | 
waiting anxiously, worried
 | 
Mom will be on pins and needles until we arrive. She'll be worried.
 | 
| on probation | 
becoming a permanent employee, proby
 | 
As an employee on probation, you will be learning new skills.
 | 
| on purpose | 
for a reason, intentional
 | 
Did she drop her glove on purpose - so he would find it?
 | 
| on queer street | 
dizzy or stunned,  not acting normal
 | 
After he hit me I felt like I was on queer street - I was dazed.
 | 
| on schedule | 
within the dates on the plan, on target
 | 
They arrived on Mars on June 11, which means they're on schedule.
 | 
| on shaky ground | 
missing a proper foundation, prone to fail
 | 
"If you don't start learning for your next exam now, you'll be on shaky ground."
 | 
| on short notice | 
without much warning, at a moment's notice
 | 
Can you come to work on short notice? Within a day or two?
 | 
| on side | 
for our side, supporting our group
 | 
In order to have a majority, we  need to bring the clerks on side.
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