Some big industry names participating at the event this year include HIET, Mountain Glass, Tec Pro, Glass Source, Mega Enterprise, Glaver
Gulf, and Electro Glass, it added.
1370 by the South Wales bard Madog Dwygraig (the first o is probably epenthetic).(3) So there is varied testimony for early Brittonic forms with the sense 'slaver' that resemble English glaver.
A verbal equivalent of this in *glafoer- (with [v]) might give Middle English glaver.
A semantic link between Welsh glafoerio 'to drivel' and Middle English glaver 'to flatter' is clarified by the OED entry for the verb slaver.
This concludes the arguments for Middle English glaver 'to flatter, deceive' as a loan from a Brittonic verb represented by Welsh glafoerio 'to drivel'.
OED quotes glauer in this sense from The Wars of Alexander, a poem perhaps composed in Lancashire, and surviving in manuscripts by Northern scribes (one from Durham or near it).(9) Glaverande in Morte Arthure 2538 ('Siche glaverande gomes greves me bott lyttill'), defined by OED as 'deceitful, flattering', has also been understood as 'chattering'.(10) On etymology, OED compares glaver 'chatter' with Scottish and Northern claver 'idle talk' and claver 'to prate', first recorded in the seventeenth century, and used by Ramsay, Burns, Scott, and Carlyle.
Yet a link between glaver 'clamour' and claver 'idle talk' deserves attention.