The phrase "in fringes" typically refers to something that is on the edge or outer limits of a particular area or group. Antonyms for this phrase would include words such as "central," "principal," and "primary," which denote something that is more important or central to a particular context. Other antonyms might include words such as "core," "midst," or "heart," which describe the center or most important part of something. Additionally, words like "mainstream," "establishment," or "conventional" might be considered antonyms, as they describe something that is widely accepted or within the norm. Overall, antonyms for "in fringes" would revolve around concepts of centrality, importance, and conformity, rather than being on the outer limits.