be (as) thin as a rail

To be extremely skinny or slender. Primarily heard in US. Have you seen Claire lately? I'm really worried about her, she's as thin as a rail! I've always been thin as a rail, even when I tried to gain weight.

Common Names:

Name	Pronounced	Usage
Grigory	gree-GO-ree	Russian
Heidi	HIE-dee (German, English), HAY-dee (Finnish)	German, Swedish, Norwegian, Danish, Finnish, English
Medraut	-	Welsh Mythology, Arthurian Romance
Balfour	['bælfə]
Ahinoam	-	Biblical
Shet	-	Biblical Hebrew