The word "under-lining" is commonly used to refer to the act of adding emphasis to a particular word or phrase by drawing a line underneath it. However, there are several antonyms for this word that can be used to express different ideas or negate its meaning altogether. These antonyms include terms like de-emphasize, downplay, minimize, detract, ignore, and overlook. While the purpose of underlining is to give greater weight to a particular word, these antonyms suggest that the word is insignificant or undeserving of special attention. By considering these antonyms, writers can better communicate their intended meaning and tone.