The antonyms for the word "became swollen" are "deflated," "shrunk," and "contracted." Deflated means to release air or lessen the pressure of something, which is the opposite of swollen. Shrunk means to reduce in size or value, and contracted means to become smaller or narrower. These antonyms are useful when describing objects or body parts that have become smaller instead of larger. For example, a deflated balloon, a shrunk shirt, or a contracted muscle are opposite meanings of something that has become swollen. Understanding antonyms can help to improve vocabulary and express ideas more precisely.