IDIOMS

clear out

(idiomatic, intransitive) to become empty

Example:   We had to clear out the attic so the guest could sleep there.
  clear out your inbox to make more space.
  The police cleared the crowd out of the street to investigate the accident.
  We need to get the trees cleared out the way before anything can drive down this path.
  They cleared out as soon as the cops arrived.
  The town is packed in the summer, but clears out in the winter.