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We found 6 dictionaries with English definitions that include the word solid as a rock:
Click on the first link on a line below to go directly to a page where "solid as a rock" is defined.

General (5 matching dictionaries)

1. (as) solid as_a_rock, solid as_a_rock: Merriam-Webster.com [home, info]
2. solid as_a_rock: Wiktionary [home, info]
3. Solid as_a_Rock (disambiguation), Solid as a Rock: Wikipedia, the Free Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

4. solid as_a_rock: Idioms [home, info]

Quick definitions from Wiktionary (solid as a rock) ▸ adjective:  (simile) Extremely thick and heavy, so as to make it impossible to move. ▸ adjective:  (simile, of a person) Very reliable and dependable ▸ Words similar to solid as a rock ▸ Usage examples for solid as a rock ▸ Idioms related to solid as a rock (New!) ▸ Popular nouns described by solid as a rock ▸ Words that often appear near solid as a rock ▸ Rhymes of solid as a rock ▸ Invented words related to solid as a rock