The phrase "what's going around" means something is spreading, such as a rumor, illness, or trend. Some antonyms for this phrase could include "contained," "quashed," "stable," or "localized." These antonyms suggest that whatever is going around has been stopped or is not widespread. For example, if a rumor is contained, it has not spread beyond a certain group of people. If an illness is quashed, it has been defeated and is no longer spreading. Likewise, if a trend is localized, it is only popular in a specific area and has not spread to other regions.
