The idiomatic expression "to get someone across" means to help or assist someone in reaching a particular goal, objective or destination. Full definition
You might be the best person for the job, but if you don't get this across in your cover letter then they won't know! (exclusive-executive-resumes.com)
You have to be able to tell your side of the story to the judge without being so upset or angry that you can't get across what you mean. (cyh.com)
I like a lot about figure one — it really gets across what the problem is quite clearly, once you think about it for a moment. (skepticalscience.com)