On display |
Shown in a public place for all to see |
"His paintings are on display at the moment." |
On duty |
Engaged in one’s regular work |
“Two doctors were on duty the night of the accident.” |
On a diet |
Eat less food or only certain types of food, usually to lose weight |
“No dessert for me please. I’m on a diet!” |
On drugs |
Regularly taking illegal drugs |
“He’s drinking heavily, and I believe he’s on drugs too.” |
On edge |
Feel tense or nervous |
"My nerves are constantly on edge these days." |
On good terms |
Have a friendly relationship |
“I’m on good terms with all my colleagues.” |
On ice |
Suspended or postponed |
“Plans for the nuclear power station are on ice.” |
On leave |
Absent from work with permission |
"Emma is on maternity leave at the moment." |
On the lookout |
Watchful and attentive so as not to miss something |
“The collector is always on the lookout for interesting items." |
On your mind |
Think about something |
"The problem was on his mind all day." |
On no account |
Not for any reason |
“On no account will I agree to the proposal. " |
On occasion |
Sometimes, but not often |
"The boss has, on occasion, lost his temper." |
On a par (with) |
As good as or equal to someone or something |
“Zoe is an amateur but she’s on a par with some professionals.” |
On purpose |
Intentionally |
"The boy banged the door on purpose." |
On principle |
Based on your beliefs |
"He voted against the proposal on principle." |
On a roll |
Enjoying a run of good luck or going from success to success |
“Once her third article was published, Lisa was on a roll.” |
On second thoughts |
After further consideration |
“On second thoughts she decided to accept the offer.” |
On a whim |
As a result of a sudden impulse, without prior planning |
“Charlie left his job on a whim and went backpacking!” |
Spot on |
Completely accurate or correct |
“Tony’s imitation of the politician was spot on !” |