在数学中，错切是特殊类型的线性变换。

在平面 {(x,y): x,y ∈R} 中，直线 y = b 垂直错切成直线 y = mx + b 是通过如下线性映射完成的

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类似的，垂直直线 x = a 水平错切成斜率 1/m 的直线表示为线性映射

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In plane geometry, a shear mapping is a linear map that displaces each point in fixed direction, by an amount proportional to its signed distance from a line that is parallel to that direction. This type of mapping is also called shear transformation, transvection, or just shearing.