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]
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This has a warm though a thin soil, which must be highly favorable to the Vine to induce so exclusive a devotion to it.
Now-a-days it is the bankrupt who flouts, and his too confiding creditors who are jeered and laughed at.
A gentleman got out of a carriage before it stopped, and fell between the rail and the platform.Elster's Folly|Mrs. Henry Wood
The first rail road opened in Brazil, the emperor and empress being present at the inauguration.The Every Day Book of History and Chronology|Joel Munsell
He felt himself the meanest, vilest thing a-crawl upon this sinful earth, and she—dear God!St. Martin's Summer|Rafael Sabatini