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.
Slump measures the consistency of a batch of fresh concrete. It refers to the ease with which the concrete flows, thus indicating the workability of the concrete. Different types of jobs require different slump ratings. Slump testing is used on-site to ensure uniform consistency between individual batches of concrete.