The crossword solution for the term 'Adjust, as a piano' is 'TUNE'. Tuning a piano is an important part of maintaining the instrument. It involves adjusting the tension of the strings to ensure that the notes are in TUNE with each other. This process can be done manually or with the help of a tuning machine. Tuning a piano is a skill that requires knowledge and experience, and it is often done by a professional piano technician.