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rock-ribbed

or rock-rib

[rok-ribd]
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adjective
  1. having ribs or ridges of rock: the rock-ribbed coast of Maine.
  2. unyielding; confirmed and uncompromising: a rock-ribbed conservative.
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Origin of rock-ribbed

First recorded in 1770–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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