Meaning: to become known, to become public knowledge Examples: I don't want it to get out that I am leaving. Please don't tell anyone. If this bad news gets out, people will panic and try to run away.
To set up
Meaning: to continue without interruption Examples: The discussion ran on for hours. Don't start that book, it runs on for hundreds of pages and never says anything.
Meaning: to be very busy doing something Examples: My new boss asks me to do a million different things. She makes me run around all the time. I am tired, I have been running around all day, fixing the house, doing the shopping, etc.