thin as a rake

Alteration of earlier lean as a rake, from Middle English lene as a rake; the last element in is potentially an modification of either Middle English *rak (“skinny animal”) (from Old Norse hrak) or rak (“rack”) after rake (“rake”), though it might merely represent that word.^[1]

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thin as a rake (not comparable)

1. (simile) Incredibly thin; at an unhealthy-looking level of thinness.