When discussing any topic, it is important to stay "on subject". However, sometimes repeating the same phrase can become monotonous. Thankfully, there are many synonyms one can use to switch things up: "relevant", "pertinent", "applicable", "related", "connected", "appropriate", "germane", and "fitting" are just a few examples. Utilizing these synonyms will allow a speaker or writer to convey their message in a fresh and engaging way while staying true to the original topic at hand. So, next time you find yourself repeatedly using "on subject", try swapping it out with one of these synonyms instead!