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on the wane
Diminishing or decreasing in strength.
on the warpath
angry and ready to fight.
on the way
In the process of arriving.
on the whole
Generally; considering everything.
on the wrong side of history
to be judged negatively by future generations.
on thin ice
In a risky or uncertain situation.
on this score
related to a particular matter or issue
on top
having victory or success
on top of
In addition to; beside something.
on top of the world
feeling extremely happy or successful
on track
Making progress toward a goal.
on what score
For what reason or basis.
on with you
A dismissive way to tell someone to leave.
on yer bike
Go away or leave quickly.
on your head be it
You take responsibility for the outcome.
on-call
person who must fix outages at any hour
ona
A name or abbreviation, often used informally.
onboard
integrate into a system or organization
once again
repeatedly or another time
once and for all
Finally; decisively settled.
once in a blue moon
Very rarely or infrequently.
once in a purple moon
very rarely or infrequently.
once in a while
occasionally, not often.
once more into the breach
Attempt something again, despite difficulty.