The phrase "gat shape" typically describes a narrow, tapered shape. Some antonyms of this phrase include: wide, broad, flat, and square. A wide shape would be the opposite of a "gat shape" as it suggests a spacious, expansive form. Broad similarly reflects a wider and more spread-out structure. Flat, on the other hand, indicates a surface that is level, without any significant changes in the height or depth of the shape. Lastly, square describes a shape with equal sides and angles, which is again, far from the tapered form of a "gat shape." Overall, the antonyms of "gat shape" suggest a broader and flatter form, and a shape that is equal on all sides.