The term 'USE AGAIN' can be summarized by two crossword solutions: REHASH (6 letters) and RECYCLE (7 letters). Rehash means to repeat or rearrange something that has already been said or done, while RECYCLE means to reuse something that has already been used. Both terms refer to the idea of using something again, either in a different form or for the same purpose. This concept is important in many areas, such as environmentalism, where it is important to reduce waste by reusing materials.