The term 'FLUFF UP' can be solved by two crossword solutions: TEASE (5 letters) and WHISK (5 letters). To fluff up something means to make it light and airy, usually by using a tool such as a WHISK or a TEASE. Teasing is the act of separating fibers or strands of material, while whisking is the act of rapidly stirring or beating ingredients together. Both of these actions can be used to fluff up food items such as eggs, cream, or mashed potatoes, as well as other materials such as pillows or blankets.