hackler Definition

1. Any of the long shining feathers on the neck of certain birds, eg cocks.
2. One of these worn in a cap, eg in the headdress of some Highland regiments.
3. angling.
An artificial fly made from hackle feathers.
4. A comb for flax (sense 2) or hemp.

hackled, hackling
1. To comb flax or hemp with a hackle.

Rough, broken or jagged.