When someone is feeling unwell or nauseated, we often describe them as looking "green around the gills". However, this phrase is not the only way to convey this sensation. There are many other synonymous expressions we can use, such as "sick as a dog", "under the weather", "feeling queasy", "nauseous", "worn out", or simply "unwell". Each phrase encapsulates the idea that someone is feeling ill, though each one carries its own nuances. By using different expressions, we can convey the same sense of discomfort in different ways, making our language both more colorful and more precise.