or rock-rib

See more synonyms for rock-ribbed on
  1. having ribs or ridges of rock: the rock-ribbed coast of Maine.
  2. unyielding; confirmed and uncompromising: a rock-ribbed conservative.

Origin of rock-ribbed

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

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