(as) solid as a rock

: being without an internal cavity

: printed with minimum space between lines

: joined without a hyphen

: a geometrical figure or element (such as a cube or sphere) having three dimensions — see Volume Formulas Table

: a substance that does not flow perceptibly under moderate stress, has a definite capacity for resisting forces (such as compression or tension) which tend to deform it, and under ordinary conditions retains a definite size and shape

: the part of a solution or suspension that when freed from solvent or suspending medium has the qualities of a solid

: in a solid manner

: to move back and forth in or as if in a cradle

: to cause to sway back and forth

: to cause to shake violently

: a rocking movement

: popular music usually played on electronically amplified instruments and characterized by a persistent heavily accented beat, repetition of simple phrases, and often country, folk, and blues elements

: distaff

: the wool or flax on a distaff

: a large mass of stone forming a cliff, promontory, or peak

: a concreted mass of stony material

: consolidated or unconsolidated solid mineral matter