Shut away
Definition 1 of 2
Pro Tip 1/3Emotional Distance
Used when someone avoids social interaction, driven by emotion. 
Grieving, she shut herself away and ignored all her friends.
Pro Tip 2/3Voluntary Isolation
Highlights a person's choice to stay away from others. 
He shut himself away to focus on writing his novel.
Pro Tip 3/3Physical Seclusion
Emphasizes being in a confined space away from people. 
The artist shut herself away in a small studio to work.