Source : Webster's Revised Unabridged Dictionary (1913)

Waddle \Wad"dle\, v. i. [imp. & p. p. {Waddled}; p. pr. & vb. n.
   {Waddling}.] [Freq. of wade; cf. AS. w[ae]dlian to beg, from
   wadan to go. See {Wade}.]
   To walk with short steps, swaying the body from one side to
   the other, like a duck or very fat person; to move clumsily
   and totteringly along; to toddle; to stumble; as, a child
   waddles when he begins to walk; a goose waddles. --Shak.

         She drawls her words, and waddles in her pace. --Young.

Waddle \Wad"dle\, v. t.
   To trample or tread down, as high grass, by walking through
   it. [R.] --Drayton.

Source : WordNet®

waddle
     n : walking with a waddling gait; walking with short steps and
         the weight shifting from one foot to the other

waddle
     v : walk unsteadily; "small children toddle" [syn: {toddle}, {coggle},
          {totter}, {dodder}, {paddle}]