1
general::
Also, cover the ground or a lot of ground. 1. Go a given extent or considerable distance, especially at a satisfactory speed. For example, She really knows how to cover ground with her studies, or This outfielder covers a lot of ground. [Early 1800s] 2. Deal with or accomplish in a certain way, as in This history text covers the ground quite well. [Late 1800s] Also see COVER THE FIELD.
American Heritage Idioms