the world > matter > physics > mechanics > force > stress or force exerted and tending to deform > [noun] > alteration of form or dimensions caused by stress > sheet > lines of shear directions (2)
a slip line, or a cluster of such lines.
(a) a fine line visible on a polished crystalline surface where it is cut by a slip plane; (b) a line in a solid whose tangent at any point is one of…