There are a few different ways that you can apply to smooth out couch cushions. First, use a vacuum cleaner with the upholstery attachment. This will help to remove any dirt or debris that may be causing the cushions to be lumpy. Another way is to place the cushions in the sun for a few hours. The heat will help to loosen any fibers that may cause the cushions to misshapen. Finally, you can try using a steamer on the couch cushions. This will help to loosen any wrinkles or creases in the fabric.