The phrase "grey sweatshirt" refers to a garment that is typically made from cotton or polyester blend fabric and features a grey color. A sweatshirt is a type of casual wear, often worn as an outer layer over other clothing items such as t-shirts or tank tops. The term "grey" refers to the color of the material used in making the garment, which can range from a light grey to a darker shade depending on the specific hue chosen by the designer or manufacturer.