Wiktionary
n. (context baseball English) A base without a runner on it.
Usage examples of "empty base".
During local night, a distinct chill tended to settle over the mostly empty base.
Shift the Hyperion group into the empty base in Mnemosyne, for instance, if that base is still usable.
Besides an almost empty base, no ships in, and the wormfaces feeding, the Mother Thing's plan required that all this happen shortly before a particular hour of the Plutonian night.
For answer, she disengaged her tail, put it to her empty base, and popped the little communication ball in.
Old vid machines could have taught them something about the redoubt base and the surrounding area, if not for the fact that all the tapes remaining were sec camera recordings, showing nothing but an empty base.