riprap

noun, verb — 3 senses

riprap

noun

UK /ˈɹɪpɹap/

Etymology Apparently a reduplication (with vowel dissimilation) of rap (“blow, stroke”).

1

An underwater bank seen as a danger to shipping.

  • They hold on, spray flying, the ceaseless racket of water impacting on rock all but swallowing them, the river pitching dizzily, snags and riprap raking like claws at the bottom of the boat.1982, TC Boyle, Water Music, Penguin, published 2006, page 423:
2

Canada, US Rocks or other materials used to shore up an embankment, deter or prevent erosion, guide shipping, or serve as a temporary mooring.

riprap

verb

Etymology Apparently a reduplication (with vowel dissimilation) of rap (“blow, stroke”).

1

To form a riprap in or upon.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.