Definition of run on phrasal verb from the Oxford Advanced Learner's Dictionary

 

run on

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to continue without stopping; to continue longer than is necessary or expected The meeting will finish promptly—I don't want it to run on.
[no passive] if your thoughts, a discussion, etc. run on a subject, you think or talk a lot about that subject
See the Oxford Advanced American Dictionary entry: run on