noun
curve of a sword
Specifically the curvature along the blade of a Japanese sword, an important aesthetic and functional feature.
日本刀の反りは、刃の美しさを決める要素の一つだ。
The curve of a Japanese sword is one of the factors that determine the beauty of the blade.
湾曲 is a more technical or formal term for curvature, often used in scientific or medical contexts, while 反り is more everyday and often implies a warp or intentional bend.
曲がり refers to a bend or turn in a road, pipe, etc., and is more about a change in direction rather than a continuous curve like 反り.
Derived from the verb 反る (そる, to warp or bend). The noun form 反り nominalizes the action/state of bending.