on the solid

on the solid

[′ȯnthə ′säl·əd]
(mining engineering)
Pertaining to the practice of blasting heavy charges of explosives, in lieu of undercutting or channeling.
References in classic literature ?
Had they remained on the solid earth, they would have found it easily enough--ay, they would have found that they themselves were precisely testing truth with every practical act and thought of their lives.