\Hob"nail`\, n. [1st hob + nail.]
1. A short, sharp-pointed, large-headed nail, -- used in
   shoeing houses and for studding the soles of heavy shoes.
2. A clownish person; a rustic. --Milton.
{Hobnail liver} (Med.), a disease in which the liver is
   shrunken, hard, and covered with projections like
   hobnails; one of the forms of cirrhosis of the liver.

\Hob"nail`\, v. t.
To tread down roughly, as with hobnailed shoes.
      Your rights and charters hobnailed into slush.
                                               --Tennyson.