riprap

American  

[rip-rap] / ˈrɪpˌræp /

noun

1. a quantity of broken stone for foundations, revetments of embankments, etc.

2. a foundation or wall of stones thrown together irregularly.

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verb (used with object)

riprapped, riprapping

1. to construct with or strengthen by stones, either loose or fastened with mortar.

Etymology

Origin of riprap

First recorded in 1570–80; gradational reduplication of rap ¹

Explanation

Riprap isn't a cool new genre of music; it's a layer of rocks or rubble placed on shorelines or slopes to stop erosion and protect the land. The term riprap refers to layers of large rocks, concrete, or other heavy materials used to stabilize riverbanks, coastlines, or steep hills. By absorbing the force of water or preventing landslides, riprap protects structures, natural habitats, and landscapes from erosion. Riprap is commonly seen along dams, road structures, and waterfronts, creating a barrier that serves as armor for the shoreline.

Example Sentences

Crews placed 5,900 tons of large boulders, known as riprap, along the rail, which are intended to absorb flowing water and stabilize potential runoff that may obstruct the rail.

From Los Angeles Times • May 29, 2025

“But what do we do about the future? We’re not just talking about riprap and wharfs, we’re talking about being ready in many ways.”

From Seattle Times • Feb. 14, 2024

I was walking toward the riprap piles when I noticed a wooden picnic table, sun-blasted but still sturdy.

From Los Angeles Times • Mar. 2, 2023

The river here runs in a channel enclosed in stretches of rocky riprap barriers, which were built decades ago after floods washed out homes.

From Los Angeles Times • Jan. 30, 2023

The edge of the lake a riprap of twisted stumps, gray and weathered, the windfall trees of a hurricane years past.

From "The Road" by Cormac McCarthy