(as) skinny as a rail
(redirected from as skinny as a rail)(as) skinny as a rail
Extremely thin. I was always skinny as a rail growing up, but I really filled out once I hit puberty. You want to play football? But you're as skinny as a rail—you'll get creamed!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.