"To soften the butter" means to make the butter warmer and easier to spread or mix.
Sentences with «to soften the butter»
Process in a food processor with softened butter until smooth. (easynaturalfood.com)
In the bowl of an electric mixer fitted with the paddle attachment, beat the 1/2 cup of softened butter with the sugars until well combined, about 2 minutes. (spachethespatula.com)
In another bowl add softened butter, eggs, milk, yogurt. (doubletherecipe.com)