To manage to gain access to.
I have a lot of money in my trust fund. I just can't get at it.
To understand or ascertain by investigation.
We need to get at the root cause of all this.
To mean, signify.
I don't understand. What are you getting at?
To attack verbally or physically; to annoy, bother.
He's a bit disheartened. The newspapers have been getting at him again.
To persuade by intimidation, to tamper with.
That was a ridiculous verdict. I think the jury was got at.
To contact someone.
I've got some things to do for about an hour. After that, get at me.