Rip-Rap
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1. \Rip"rap`\, n. [Cf. {Rap}.] (Masonry)
   A foundation or sustaining wall of stones thrown together
   without order, as in deep water or on a soft bottom.
   

2. \Rip"rap`\, v. t. [imp. & p. p. {Riprapped}; p. pr. & vb.
   n. {Riprapping}.]
   To form a riprap in or upon.
   

1. Layer of large, durable materials (usually rocks; sometimes car bodies, broken concrete, etc.) used to protect a stream bank or lake shore from erosion; may also refer to the materials used.
2. A layer of irregularly placed stones or debris positioned on the bank of a stream or beside a levee to resist the eroding action of flowing water.