Meaning: to think about the past
Examples:
It is important to look ahead at the future, and to not spend too much time looking back.
When I look back at my childhood, I realize it was a very good childhood.
To get out
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.