The Collaborative International Dictionary of English v.0.48:

Prate \Prate\, v. i. [imp. & p. p. Prated; p. pr. & vb. n.
   Prating.] [Akin to LG. & D. praten, Dan. prate, Sw. & Icel.
   prata.]
   To talk much and to little purpose; to be loquacious; to
   speak foolishly; to babble.
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         To prate and talk for life and honor.    --Shak.
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         And make a fool presume to prate of love. --Dryden.
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