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]
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
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