out (of sth)
1.
to prevent sb/sth from entering a place :
Mum, Ben keeps shutting me out of the bedroom!
sunglasses that shut out 99% of the sun's harmful rays
2.
to not allow a person to share or be part of your thoughts; to stop yourself from having particular feelings :
I wanted to shut John out of my life for ever.
She learned to shut out her angry feelings.
If you shut me out, how can I help you?