Definitions from Wiktionary (hackle)

▸ noun:  An instrument with steel pins used to comb out flax or hemp.
▸ noun:  (usually now in the plural) One of the long, narrow feathers on the neck of birds, most noticeable on the rooster.
▸ noun:  (fishing) A feather used to make a fishing lure or a fishing lure incorporating a feather.
▸ noun:  (usually now in the plural) By extension (because the hackles of a rooster are lifted when it is angry), the hair on the nape of the neck in dogs and other animals; also used figuratively for humans.
▸ noun:  A type of jagged crack extending inwards from the broken surface of a fractured material.
▸ noun:  A plate with rows of pointed needles used to blend or straighten hair.
▸ noun:  A feather plume on some soldier's uniforms, especially the hat or helmet.
▸ noun:  Any flimsy substance unspun, such as raw silk.
▸ noun:  (uncountable, slang) Pluck; courage or energy.
▸ verb:  To dress (flax or hemp) with a hackle; to prepare fibres of flax or hemp for spinning.
▸ verb:  (transitive) To separate, as the coarse part of flax or hemp from the fine, by drawing it through the teeth of a hackle or hatchel.
▸ verb:  (archaic, transitive) To tear asunder; to break into pieces.

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