Gabble, v. i. [imp. & p. p. Gabbled; p. pr. & vb. n. Gabbling.]
Etymology: [Freq. of gab. See Gab, v. i.]
1. To talk fast, or to talk without meaning; to prate; to jabber. Shak.
2. To utter inarticulate sounds with rapidity; as, gabbling fowls. Dryden.
1 other Webster entry under this spelling
Gabble, n.
1. Loud or rapid talk without meaning. Forthwith a hideous gabble rises loud Among the builders. Milton.
2. Inarticulate sounds rapidly uttered; as of fowls.
Shades of meaning
Fernald has no entry of its own for gabble; he lists it under babble.
Where he writes about it:
The cackle of a hen, the gabble of a goose, the chatter of a magpie, the babble of a running stream, as applied to human speech, indicate a rapid succession of what are to the listener meaningless sounds. — from babble