Decurtate means to cut short or reduce. The antonyms of decurtate are lengthen, prolong, extend, expand, increase, amplify, enhance, augment, escalate, and grow. These are the opposite of reducing, as they increase or make longer. For instance, lengthen means to make something longer, such as a piece of cloth, a rope, or a speech. Prolong means to continue something, like a conversation or an event, beyond its natural limit. Similarly, extend means to enlarge the space or time of something, while expand means to make something bigger. By using these antonyms of decurtate, we can communicate our thoughts and ideas more effectively.