thin as a rail

(as) thin as a rail

Extremely skinny or slender. Have you seen Claire lately? She's become as thin as a rail in the last six months! I've always been thin as a rail, even when I try to pack on some muscle.
See also: rail, thin
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

thin as a rail

Very slender, as in I do not know why she's dieting; she's thin as a rail already. This simile, which uses rail in the sense of "a narrow bar," has largely replaced such other versions as thin as a lath or rake, although the latter is still common in Britain. [Second half of 1800s]
See also: rail, thin
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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