Pitching downhill

does pitching “downhill” mean tall and fall?

no it refers to the angle that the ball is coming in at…a guy that throws downhill usually has a higher arm slot and gets good leverage in his mechanics allowing him to throw the ball with a downward plane which make the ball harder to square up for a hitter. typically taller pitchers throw the ball downhill better but lincecum is an example of a small guy that does it well.