Wiktionary
empty out
vb. (context transitive English) To completely empty.
Usage examples of "empty out".
But about then I was beginning to wonder if we wouldnt arrive in Juniper Springs looking like those circus cars that drive out into the middle of the ring and empty out twelve clowns and a donkey.
The square began to empty out as people decided they were needed elsewhere.
Sam felt hope vanish, felt fascination empty out and drain away, then refill from what truly, simply was on this strangest, most magical night.