Off and on (On again off
Something that switches between two conditions.
Their relationship has always been on again off again.
They get along off and on.
It's been raining off and on all day today.
The announcer made an off-color remark that shocked us.
During a TV or radio broadcast.
I can't believe the host said a cuss word on air.
On board (get on
Agree or be party to.
Get on board with the project or you’re fired.
On cloud nine:
You must have been on cloud nine when you found out!
He’s on edge about the results.