godan verb (-ru), intransitive verb
Often implies physically going back to a previous location or point; can also be used figuratively for returning to a topic or state. The 立ち component suggests a deliberate action of standing and moving back.
See also: 戻る
彼は忘れ物に気づいて、家に立ち戻った。
He realized he had forgotten something and returned home.
We've gotten off track, so let's return to the main topic.