surname, attested from late 12c., probably meaning bald head; cf. Wyclif Stye up, ballard, where Coverdale translates Come vp here thou balde heade [2 Kg.2:23-24, where God kills 42 children for making fun of Elijah's lack of hair.]
A slump is a form of mass wasting that occurs when a coherent mass of loosely consolidated materials or rock layers moves a short distance down a slope. Movement is characterized by sliding along a concave-upward or planar surface. Comments.
However, man can inadvertently accelerate the process of slump development by: 1  the emplacement of a load on top or along the slope, itself (for example, the dike in the photo, above)  increasing soil moisture content, by lawn watering or installation of drain fields within prone regions.