solid as a rock
- (simile) Extremely thick and heavy, so as to make it impossible to move.
- We're not going to be able to break down this door, it's solid as a rock.
- (simile, of a person) Very reliable and dependable
- Stewart has been solid as a rock ever since becoming the new vice-chairman.
- (thick and heavy): rock-solid
- (reliable and dependable): rock-solid
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