Etymology
Advertisement

rock-ribbed (adj.)

1776, originally of land, "having rocky rib-like ridges;" figurative sense of "resolute" is recorded by 1887; see rock (n.) + rib (n.). 

Others are reading

Advertisement
Advertisement
Definitions of rock-ribbed

rock-ribbed (adj.)
tradition-bound and obstinately opinionated;
rock-ribbed republican
Synonyms: die-hard
rock-ribbed (adj.)
abounding in or bordered by rocky cliffs or scarps;
the rock-ribbed coast of Maine
Synonyms: rockbound
From wordnet.princeton.edu