Etymology
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rip-rap (n.)

also riprap, "loose stone thrown down in water or soft ground as foundation," 1822, American English, perhaps connected with earlier nautical word rip-rap meaning "stretch of rippling water" (often caused by underwater elevations), 1660s, which is perhaps of imitative origin (compare riprap "a sharp blow," 1570s). Also compare rip (n.2).

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