When someone is talking excessively or repetitively about a particular topic, we often use the phrase "going on about." However, there are several synonyms for this phrase that can be used to convey the same meaning in different contexts or situations. These synonyms include harping on, fixating on, obsessing over, rambling about, droning on, belaboring, dwelling on, recapping, repeating oneself, and ad nauseam. Each of these phrases carries a slightly different connotation and can be used in various ways to describe someone's long-winded or monotonous speech.