Definitions for "Cutting in"
A Brushing technique used to apply Paint to produce a true finished-line-edge against an adjoining surface
The brushed application of paint to the perimeter of a broad surface. (e.g. walls and ceilings). Also , the accurate brushed application of paint onto a surface while keeping an adjacent surface paint-free. (e.g. window sash)
The painting of a surface adjacent to another surface that must not be painted. For example, painting the frame of a window but not the glass.
Keywords:  butter, flour, ingredient, mix, dry
Mix a dry ingredient like flour and a solid one like butter until they become like small particles.