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Webster 1913 Edition

(hăf′f’l)

Verb.

[Cf. G.

haften

to cling, stick to, Prov. G., to stop, stammer.]

To stammer; to speak unintelligibly; to prevaricate.

[Prov. Eng.]

Halliwell.

haffle ‎(third-person singular simple present haffles, present participle haffling, simple past and past participle haffled)

(Britain, dialect) To stammer; to speak unintelligibly; to prevaricate.
(Can we find and add a quotation of Halliwell to this entry?)