1. Home
2. Idioms
3. be (as) thin as a rail

be (as) thin as a rail

---

---

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.

See also: rail, thin