The phrasal verb "run on" is primarily used in informal contexts, although it can occasionally appear in semi-formal situations, particularly in informal writing or speech reporting. Its usage often involves describing something that continues for longer than expected, like a meeting or speech that "runs on" past its intended end time. It can also refer to devices or machines that operate using a particular power source, such as "The car runs on electricity." In these cases, it is used in more technical or neutral contexts. Overall, "run on" typically implies extension of duration or operation, making it versatile for multiple settings, from casual conversations about events to discussions about technologies.
B1
PreIntermediate
1. To continue without stopping, often unnecessarily.
The meeting ran on for hours without a break.
Her speech ran on longer than expected, losing the audience's attention.
2. To talk excessively without getting to the point.
He tends to run on and on when he's nervous.
I wish she wouldn't run on about her vacation plans every time we meet.