The phrase "gotten fat" is often used to describe a person who has put on weight. However, there are several antonyms that can be used to describe someone who is maintaining or losing weight. These include "slim," "fit," "toned," "healthy," "svelte," "lean," and "shape." These words are commonly used in fitness and health contexts to describe individuals who are actively working towards their physical wellness goals. While gaining a few pounds is a natural and normal part of life, it is important to keep in mind that maintaining a healthy weight is crucial for overall wellbeing.