keep on

verb4

1. •
   To persist or continue.

   • Keep on trucking!
   • Mum, Jimmy keeps on poking me!
2. •
   To persist in talking about a subject, perhaps to the annoyance of the listener.

   • For goodness sake, will you stop keeping on about it!
3. •
   To cause or allow to remain in an existing position.

   • The new boss would like to keep the present secretary on.
4. •
   To cause or allow to remain in the on or open position.

   • Should I turn off this light or keep it on?
   • Should I shut off this water or keep it on?