The opposite of fall is RISE, which is a four-letter word. RISE is the action of moving upwards or increasing in level or amount. It is often used to describe the sun, which rises in the morning and sets in the evening. RISE can also be used to describe the motion of an object or person, such as when someone stands up or when a balloon rises into the air. RISE can also be used to describe the increase in value of something, such as a stock or currency.