The phrase "person in street" can have different antonyms depending on the context in which it is used. If we're talking about someone who is uninformed or lacking expertise on a topic, we can use antonyms such as "expert," "specialist," or "professional." Alternatively, if we're referring to someone who is wealthy or powerful, antonyms might include "commoner," "peasant," or "underprivileged." Another possible antonym is "celebrity," which refers to someone who is well-known, while the "person in street" can imply a more anonymous or ordinary figure. Whatever the context, antonyms can help us better understand the nuances of a word or phrase and expand our vocabulary to express different shades of meaning.