The phrase "an Englishman's home is his castle" implies that a person's home is considered a private sanctuary that is protected from invasion or infringement. Synonyms for this phrase include "a man's home is his refuge," "the home is the sanctuary of the soul," or "a person's residence is their fortress." These phrases all allude to the idea that one's home should be a safe and secure place, shielded from the outside world and its potential dangers. It is important for people to feel a sense of peace and safety in their homes, and these synonyms reinforce the notion that a home should be a haven for those who reside within its walls.
