Source : Webster's Revised Unabridged Dictionary (1913)

Clatter \Clat"ter\ (kl[a^]t"t[~e]r), v. i. [imp. & p. p.
   {Clattered} (-t[~e]rd); p. pr. & vb. n. {Clattering}.] [AS.
   clatrung a rattle, akin to D. klateren to rattle. Cf.
   {Clack}.]
   1. To make a rattling sound by striking hard bodies together;
      to make a succession of abrupt, rattling sounds.

            Clattering loud with iron clank.      --Longfellow.

   2. To talk fast and noisily; to rattle with the tongue.

            I see thou dost but clatter.          --Spenser.

Source : WordNet®

clattering
     adj : a rattling sound as of hard things striking together; "a
           clattering typewriter"; "the clattering sound of
           dishes" [syn: {clattery}]