be (as) solid as a rock
(redirected from be solid as a rock)be (as) solid as a rock
To be stable, sturdy, and reliable. They've been married for 50 years, so their relationship has to be solid as a rock. That table must be as solid as a rock to withstand the ceiling collapse with hardly a scratch.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.