On approval

Buying something with the right to return it.We carefuly looked at the chair which we had bought on approval.

On any account

For any purpose, for any reason.I am not going to talk to that woman on any account.

On and on

Continually, at tedious length.The speech continued on and on until we finally left the meeting.

On and off

Intermittently, now and then, not regularly.It has been raining on and off since early this morning.

On an even keel

Calm and not likely to change suddenly, in a steady and well-balanced situation (the keel is the bottom of a boat or ship and when the boat is... Read more →

On good terms with (someone)

To be friendly with someone, to have a good relationship with someone.We are on good terms with our neighbors.

On foot

By walking.We plan to go downtown on foot.

On fire

Burning, being burned with flames.The house was on fire when the fire truck arrived.

On faith

Without question or proof.I take it on faith that my friend will help me if I need help.

On everybody’s lips

Many people are talking or thinking about the same thing.The scandal about the famous actress is on everybody's lips.