riprap

詳細解釋：

rip.rap

n.（名詞）
A loose assemblage of broken stones erected in water or on soft ground as a foundation.
亂石基，亂石扶牆：碎石塊的鬆散堆集、或作為地基樹立於水中或鬆軟的土地上
The broken stones used for such a foundation.
亂石，碎石：用作這種地基的碎石
v.tr.（及物動詞）
rip.rapped,rip.rap.ping,rip.raps
To construct a riprap in or on.
在…里堆亂石，在…上修砌亂石基
To strengthen with a riprap.
用亂石加固

來源：
Reduplication of rap
rap的重迭