Throw underhanded is a type of throwing motion used in sports such as baseball, softball, and cricket. It involves the thrower releasing the ball with an underhand motion, usually from the shoulder or elbow. The ball is released with backspin, which helps it to travel further and with more accuracy. The thrower's arm should be bent at the elbow and the wrist should be bent slightly forward. This type of throw is often used when throwing to a base or when trying to get a runner out. TOSS is another word for throw, so the four letter solution to the crossword is TOSS.