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]


Nearby words

  1. thimblewit,
  2. thimbu,
  3. thimerosal,
  4. thimphu,
  5. thin,
  6. thin client,
  7. thin edge of the wedge,
  8. thin film,
  9. thin on top,
  10. thin register

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.