The antonyms for the word "become swollen" are deflate, shrink, and contract. Deflate means to release the air or gas from something, causing it to become smaller. Shrink refers to the process of becoming smaller in size or amount. Contract means to become smaller or shorter in length, often due to tightening or shrinking. These words can be used to describe different physical and emotional states, such as deflating a balloon, shrinking a tumor, or contracting your muscles during exercise. By using antonyms, we can express a range of emotions and experiences, creating a more nuanced and precise language.