The Collaborative International Dictionary of English v.0.48:

Glaver \Glav"er\, v. i. [Of Celtic origin; cf. W. glafr
   flattery.]
   1. To prate; to jabber; to babble. [Obs.]
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            Here many, clepid filosophirs, glavern diversely.
                                                  --Wyclif.
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   2. To flatter; to wheedle. [Obs.]
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            Some slavish, glavering, flattering parasite.
                                                  --South.
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