solid as a rock
idiomPart ofsolid
solid as a rock — idiom
1. Extremely firm, strong, or reliable — used for both physical objects and abstrac
1.idiom
Definition
Extremely firm, strong, or reliable — used for both physical objects and abstract things like relationships or plans.
Example
After ten years, Christopher and Diya's marriage is still solid as a rock.
The old bridge is built on pillars that are solid as a rock even after a hundred years.