Gray-haired and Sick as a dog

Gray-haired adjective - Showing characteristics of age, especially having grey or white hair.

Sick as a dog and gray-haired are semantically related. In some cases you can use "Sick as a dog" instead an adjective phrase "Gray-haired".

Gray-haired and sick as a dog are semantically related. Sometimes you can use "Gray-haired" instead an adjective phrase "Sick as a dog".