Source : Webster's Revised Unabridged Dictionary (1913)

Prattle \Prat"tle\, v. i. [imp. & p. p. {Prattled}; p. pr. & vb.
   n. {Prattling}.] [Freq. of prate.]
   To talk much and idly; to prate; hence, to talk lightly and
   artlessly, like a child; to utter child's talk.