- 1 to prevent somebody/something from entering a place Mum, Ben keeps shutting me out of the bedroom! sunglasses that shut out 99% of the sun’s harmful rays
- 2to 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?