Antonyms for the term "whoop up" refer to actions or states that are opposite in meaning. These may include expressions like discourage, dissuade, deflate, depress, or dampen, among others. While "whoop up" denotes excitement or enthusiasm, its antonyms describe attitudes that can dampen or diminish the momentum of an event or activity. For instance, a manager may use words like "dampen" or "depress" to express the need for caution or reservation around certain projects or initiatives that may have high risk or low potential. Conversely, a speaker may use antonyms like "deflate" or "dissuade" to criticize or discourage excessive hype or over-enthusiasm around a topic or event.