clickety-clack

from WordNet (r) 3.0 (2006)

clickety-clack
    n 1: a fast and rhythmic click-clack; "the clickety-clack of the
         typewriters" [syn: {clickety-clack}, {clickety-click}]

from The Collaborative International Dictionary of English v.0.48

clickety-clack \clickety-clack\, clickety-click
\clickety-click\n.
   a fast and rhythmic clicking sound, as of "click-clack"; as,
   the clickety-clack of the typewriters.

   Syn: clickety-clack.
        [WordNet 1.5]