/dɪˈfɔːm/
If something deforms a person’s body or something else, it causes it to have an unnatural shape. In technical English, you can also say that the second thing deforms when it changes to an unnatural shape. 使成畸形
例：
Bad rheumatoid arthritis deforms limbs.
严重的类风湿性关节炎会使肢体畸形。