Sc. var. GABBLE sb. and v.; hence Yabbler = GABBLER. (Cf. yab, yabber = GAB, GABBER.)
1808. Jamieson, To yabble, v.n., to gabble, Fife.
1819. W. Tennant, Papistry Stormd (1827), 204. And than sic skellochin and shout, Was never sic a yabble!
1871. W. Alexander, Johnny Gibb, xi. There was a general clustering about him as Samie yabbled out the particulars.
1901. Lawson, Remin. Dollar Acad., 48. An outpost of these cacklers and yablers sounded the alarm.