It acts like a waling, and is useful when the ground is treacherous, and provided it is level.
There must also be a waling piece or cap at or near the top, anchored back.
The lower ends should be in a small trench and have a waling piece in front of them.
Come away, chap—come away, gentle chap—nae time to be picking and waling your steps.'
Old English walu "ridge," as of earth or stone, later "ridge made on flesh by a lash" (related to weal (n.2)); from Proto-Germanic *walo (cf. Low German wale "weal," Old Frisian walu "rod," Old Norse völr "round piece of wood," Gothic walus "a staff, stick," Dutch wortel, German wurzel "root"). The common notion perhaps is "raised line." Used in reference to the ridges of textile fabric from 1580s. Wales "horizontal planks which extend along a ship's sides" is attested from late 13c.
A mark raised on the skin, as by a whip; a weal or welt. v. waled, wal·ing, wales
To raise marks on the skin, as by whipping.