Source : Webster's Revised Unabridged Dictionary (1913)

Heckle \Hec"kle\, v. t.
   To interrogate, or ply with questions, esp. with severity or
   antagonism, as a candidate for the ministry.

         Robert bore heckling, however, with great patience and
         adroitness.                              --Mrs. Humphry
                                                  Ward.

Heckle \Hec"kle\, n. & v. t.
   Same as {Hackle}.

Source : WordNet®

heckle
     n : a comb for separating flax fibers [syn: {hatchel}]

heckle
     v 1: comb with a heckle; "heckle hemp or flax" [syn: {hackle}, {hatchel}]
     2: challenge aggressively