The crossword solution for the term 'CURVE DOWNWARD' is BOW, which is a three-letter word. A BOW is an arch-shaped structure that curves downward, often used to support a bridge or other structure. It can also refer to the shape of a ship's hull or the shape of a person's back when bending forward. In archery, a BOW is a weapon used to shoot arrows. Bows are also used in music to play stringed instruments.