Source : Webster's Revised Unabridged Dictionary (1913)

Hammer \Ham"mer\, v. t. [imp. & p. p. {Hammered}; p. pr. & vb.
   n. {Hammering}.]
   1. To beat with a hammer; to beat with heavy blows; as, to
      hammer iron.

   2. To form or forge with a hammer; to shape by beating.
      ``Hammered money.'' --Dryden.

   3. To form in the mind; to shape by hard intellectual labor;
      -- usually with out.

            Who was hammering out a penny dialogue. --Jeffry.

Source : WordNet®

hammering
     n : the act of pounding (delivering repeated heavy blows); "the
         sudden hammer of fists caught him off guard"; "the
         pounding of feet on the hallway" [syn: {hammer}, {pound},
          {pounding}]