The crossword solution for the term STIRS IN, SAY is ADDS. This term is used to describe the action of putting something into a mixture or container in order to combine it with other ingredients. It is often used in cooking to refer to adding ingredients to a recipe. For example, one might say 'I'm going to add some sugar to this cake batter' or 'I'm going to stir in some chocolate chips'. In general, adding something to a mixture or container is a way of combining it with other ingredients and creating a new product.