Frost \Frost\, v. t. [imp. & p. p. {Frostted}; p. pr. & vb. n. {Frosting}.] 1. To injure by frost; to freeze, as plants. 2. To cover with hoarfrost; to produce a surface resembling frost upon, as upon cake, metals, or glass. While with a hoary light she frosts the ground. --Wordsworth. 3. To roughen or sharpen, as the nail heads or calks of horseshoes, so as to fit them for frosty weather.