Meaning 1 · most common
have a good relationship

To have a friendly or comfortable relationship with someone.
Examples
I really get on with my new flatmate; we have a lot in common.
A: Do you get on with your boss?
B: Yeah, she's actually really easy to talk to.
Common mistake
Not: I get on my sister really well.
Say: I get on with my sister really well.
Don't drop 'with'. (American English usually says 'get along with'.)
More on “have a good relationship”Another example · Tell it apart · Goes with · Tip
Another example
In my opinion, it's important to get on with your colleagues because it makes the workplace more enjoyable.
Tell it apart
I get on with my flatmate.
Get on with your work!
Goes with
- get on with + person