1 [C] a place on your body that is bigger or fatter than usual because of an injury or illness 肿或肿胀的部位: I've got a nasty swelling under my eye. 我眼睛底下肿得厉害。

2 [U] the process of becoming swollen 肿（胀）: The disease often causes swelling of the ankles and knees. 这种病常会引致踝肿和膝肿。