The term 'ACCELERATE' can be expressed in two different ways in a crossword puzzle. The first is 'REV, ' which is an abbreviation for the verb 'REVOLVE, ' meaning to turn around or rotate. The second is 'SPEED, ' which is an action that increases the rate of motion or activity. Acceleration is the process of increasing SPEED, and it is often used in physics to describe the rate of change of velocity over time. In everyday life, acceleration is used to refer to the act of speeding up, such as when driving a car.