solid as a rock


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*solid as a rock

Cliché very solid; dependable. (*Also: as ~.) Jean has been lifting weights every day, and her arm muscles are solid as a rock. This company has always built power tools that are as solid as a rock.
See also: rock, solid
References in classic literature ?
Its body, which was unlike that of ordinary fishes, was as solid as a rock, and of a jetty blackness throughout all that portion of it which floated above the water, with the exception of a narrow blood-red streak that completely begirdled it.
Ten years with Sir Charles Chandos--as solid as a rock.