be (as) hard as nails(redirected from are hard as nails)
be (as) hard as nails
To be physically or mentally tough. I'm scared of those bikers—they all look like they're hard as nails! Our aunt is as hard as nails, so we asked her to give the eulogy, knowing that she's the only one who could do it without crying.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.