To pass a dry ingredient through a sifter, or fine mesh screen, to loosen the particles, incorporate air, and lighten the resulting product. Also, used to combine several ingredients that are passed through at the same time. The same result may be accomplished by using a wire whisk to stir the ingredients in a bowl. If a recipe calls for presifted ingredients, sift first and then measure. If it calls for a certain amount of the ingredient, sifted, measure first.