if you think about it, it’s possible to literally get over something, for example get over a fence—but this is not how the phrase is generally used in the English language. Imagine having a really difficult time, like breaking up with your girlfriend or boyfriend—it’s hard. But eventually once time passes and you no longer think about your ex, it means that you’ve gotten over him/her, you no longer worry about it and it no longer affects you in a negative way. It’s also possible to get over an illness, which would mean that you’ve fully recovered.