The crossword solution for the term 'become deflated' is SAG, which stands for 'subside and go down'. This phrase is used to describe a situation in which something loses its shape or volume due to a decrease in air pressure. This can happen to balloons, tires, and other objects that contain air. It can also be used to describe a person's mood or enthusiasm, as when someone's excitement or confidence 'DEFLATES' after a setback.