Origin of one-off
Examples from the Web for one-off
The former senior intelligence official said the hacking bore the hallmarks of a “campaign,” and not a one-off operation.
Most Cacophony events were one-off affairs, just enough to jam the culture a bit before moving on.Before the Bros, SantaCon Was as an Anti-Corporate Protest|David Freedlander|December 12, 2014|DAILY BEAST
That could be much more effective than a high-profile, one-off high-level Kerry visit.Everyone Says John Kerry Should Stay Out of the Middle East|Josh Rogin|July 13, 2014|DAILY BEAST
Is this a one-off or is Brown working the fake podiatrist long-con?Lesser Mysteries for Those With Breaking News Fatigue|Kelly Williams Brown|March 23, 2014|DAILY BEAST
According to an account in The Anglo-Saxon Chronicle, written in the 9th century, that failed Viking raid was hardly a one-off.
British Dictionary definitions for one-off
- something that is carried out or made only once
- (as modifier)a one-off job