"Stranger within the gates" is a phrase that is often used to describe an unfamiliar or unknown person who enters a certain space or community. There are several synonyms for this phrase that can be used interchangeably, such as newcomer, unknown visitor, outsider, interloper, and intruder. Each of these has its own nuances to describe different situations. A newcomer is typically someone who has just arrived and is not yet familiar with the surroundings. An outsider may refer to someone who is not part of the group, while an intruder implies a more aggressive or unwelcome presence. No matter which synonym you use, the underlying meaning remains the same - someone who is not yet accepted or welcomed into a particular community.