The term 'Tire Difficulty' can be summarized by the crossword solution 'FLAT, ' which is a four-letter word. A FLAT tire is a common problem that occurs when the air pressure in a tire is too low, causing it to lose its shape and become unable to support the weight of the vehicle. This can lead to a decrease in traction and handling, as well as an increase in fuel consumption. FLAT tires can be caused by a variety of factors, including punctures, improper inflation, and wear and tear.