“Do you get what I'm trying to get across?”
You're reviewing a difficult writing assignment with a group of classmates. You asked a classmate to read your essay. Now she has finished reading it, and you want to ask her whether she understood it. You say this.
Do you get what I'm trying to get across?
To "get" something means to understand it:
"Get" is more casual than "understand".
Use this phrase to talk about whether you can understand someone:
Do you get what I'm saying?
There are a variety of different words with similar meaning to "say" which can be used in this way:
Do you get what I'm suggesting?
I'm not sure that I get what you're implying.
It's common to use "trying to ___" in this phrase when someone is not being successful in their communication:
I'm sorry. I just don't get what you're trying to say.
The phrasal verb "get across" means to successfully communicate. If you are able to "get across" an idea, it means that the people who are listening or reading are able to understand what you wanted to communicate:
The main thing I want to get across to you today is the importance of slow, steady effort toward your goals.
People use "get across" for complicated ideas, such as logical arguments in essays. You wouldn't use "get across" to talk about communicating the price of something, for example. That's too simple of an idea.