A retaining block positioned below and against something on an incline to brace it from rolling or sliding.
A retaining block for a terrace stone wall is constructed when the stone-wall foundation threatens to slide. This retaining block is a small stone wall; it begins below the foundation stones, extending up to partially or completely cover the foundation stones. Bracing a wall above a pond field, laba, the retaining block extends down as far as the hard-packed basin floor, pānad. A small stone-wall retaining block may brace against soil or rocks threatening to slide into a terraced area. A retaining block may consist of a log, soil or stones blocked against an object or objects such as cargo or another log on a slope and the like.