Webster's Revised Unabridged Dictionary · 1913

hackle

hackle (hak"k'l) , noun

[See Heckle, and compare Hatchel.]

1.
A comb for dressing flax, raw silk, etc.; a hatchel.
2.
Any flimsy substance unspun, as raw silk.
3.
One of the peculiar, long, narrow feathers on the neck of fowls, most noticeable on the cock, -- often used in making artificial flies; hence, any feather so used.
4.
An artificial fly for angling, made of feathers.

Hackle (hak"k'ld) , transitive verb

1.
To separate, as the coarse part of flax or hemp from the fine, by drawing it through the teeth of a hackle or hatchel.
2.
To tear asunder; to break in pieces.
The other divisions of the kingdom being hackled and torn to pieces. — Burke