反り|そりsori[2]odaka (tail-high)

1. nounwarp; curvature; bend; arch
2. nouncurve (of a sword)

• RelatedアーチNeutralLoanword for an arch or arched structure, stressing architectural form; 「反り」 is the degree to which an object such as a sword blade or board warps or curves.
• Related弓状きゅうじょうWrittenWritten/formal prose noun for something bow-shaped or arched; it stresses a curve like a drawn bow, unlike 「反り」, which measures warp or curvature.
• Related弓なりゆみなりNeutralBent like a bow, as in 「弓なりに反る」; it stresses curving into an arc, while 「反り」 names the degree of warp or curvature itself.
• Relatedアーチ形NeutralA noun for the arch shape — the loanword plus 「形」; it stresses the shape itself, while 「反り」 is the amount of warp or curvature in an object.
• Related穹窿形WrittenA rare, architecture-flavoured academic term for a dome or vault shape; much less common than 「反り」.
• AntonymまっすぐNeutralStraight, not bent, as in 「真っ直ぐな道」「真っ直ぐ進む」; the opposite of the curvature expressed by 「反り」.
• Antonym反りがないNeutralA phrase meaning there is no warp or curve — the direct opposite of the curvature that 「反り」 denotes.

Use 「反り」 for the degree something is warped or curved, as in 「刀の反り」「板の反り」; 「反りが合わない」 figuratively means not getting along. For arch structures pick 「アーチ」, for a bow-shaped arc 「弓なり」, and for straight 「真っ直ぐ」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 反そっていること。
2. 刀身とうしんの湾曲わんきょく。
3. 弦げんを張はらない弓ゆみの湾曲わんきょく。
4. 相手あいての脇の下わきのしたに頭あたまを入いれ、自分じぶんの体からだを反そらせて倒たおす技わざ。