The Collaborative International Dictionary of English v.0.48:

Haffle \Haf"fle\ (h[a^]f"f'l), v. i. [Cf. G. haften to cling,
   stick to, Prov. G., to stop, stammer.]
   To stammer; to speak unintelligibly; to prevaricate. [Prov.
   Eng.] --Halliwell.
   [1913 Webster]