thin as a rail

thin as a rail (not comparable)

1. (simile, rare) Very thin, unhealthily thin.

• skinny as a rail
• thin as a rake
• thin as a wafer

• “thin as a rail”, in Dictionary.com Unabridged, Dictionary.com, LLC, 1995–present.
• “thin as a rail” in Idioms and phrases, TheFreeDictionary.com, Huntingdon Valley, Pa.: Farlex, Inc., 2003–2025.