The crossword solution for the term 'make rougher' is 'COARSEN', which is a 7-letter word. Coarsening is a process that involves making something rougher or more coarse in texture. It is often used to describe the process of making fabrics, such as cotton, wool, and linen, more rough and durable. Coarsening can also be used to describe the process of making food, such as grains, nuts, and vegetables, more coarse in texture.