A man’s home is his castle
Definition 1 of 2
Pro Tip 1/3Privacy Emphasis
This phrase stresses the importance someone places on their home privacy. 
He always says, 'a man’s home is his castle', especially when he wants some alone time.
Pro Tip 2/3Autonomy Highlighted
It highlights a person's autonomy within their living space, free from outside control. 
She redesigned her house without input, saying a man’s home is his castle.
Pro Tip 3/3Personal Authority
The phrase expresses complete authority over one’s household decisions. 
He decided to paint the walls green, arguing that a man’s home is his castle.