The word "in-curving" refers to something that has a curved or bend shape that goes inward. The antonyms for "in-curving" are words that describe shapes that bend outward, such as "outcurving," "outward," "straight," "flat," and "protruding." These words depict a shape or form that is opposite to the curved and inward-bending nature of "in-curving." While "in-curving" often describes the shape of objects like leaves, petals, or waves, the antonyms describe shapes that are more angular or protruding, like the edges of cliffs or the shape of mountains. Using such antonyms helps us to communicate with accuracy and specificity while describing the shapes and curves in our environment.