This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of the long, slender, often glossy feathers on the neck of a bird, especially a male domestic fowl.

n. The erectile hairs along the back of the neck of an animal, especially of a dog.

n. A tuft of cock feathers trimming an artificial fishing fly.

n. A hackle fly.

v. To trim (an artificial fishing fly) with a hackle.

idiom. get (one's) hackles up To be extremely insulted or irritated.

v. To chop roughly; mangle by hacking.

verb-intransitive. To hack.

n. A feather plume on some soldier's uniforms, especially the hat or helmet.

v. To separate, as the coarse part of flax or hemp from the fine, by drawing it through the teeth of a hackle or hatchel.

v. To tear asunder; to break into pieces.

n. A comb for dressing flax, raw silk, etc.; a hatchel.

n. Any flimsy substance unspun, as raw silk.

n. 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.

n. An artificial fly for angling, made of feathers.

v. To separate, as the coarse part of flax or hemp from the fine, by drawing it through the teeth of a hackle or hatchel.

v. To tear asunder; to break in pieces.

To hack roughly; haggle. See haggle.

n. A conical covering of straw or hay, such as is used to thatch a beehive.

n. A comb for dressing flax: same as heckle, 1.

n. Any flimsy substance unspun, as raw silk.

n. One of the long slender feathers from the neck or saddle of the domestic cock, much used by anglers for making artificial flies.

n. An artificial fly made without wings to represent a caterpillar or other larva, or the larva-like body of a winged fly; a palmer.

n. In heraldry, same as bray, 2 .

To comb, as flax or hemp: same as heckle.

To tear asunder.

n. One of the long hairs which, when erected, form a crest along the neck and back of a dog.

In angling, to dress (an artificial fly) with hackle.

v. comb with a heckle

n. long slender feather on the necks of e.g. turkeys and pheasants

"Making a generalized statement, the soft hackle is the most effective fly I have ever used in rivers for trout."

hackled    hackles    hackling   

comb   

dun hackle   

hackled    hackling   

hatchel    heckle    panache    plume   

Spackle    cackle    crackle    grackle    jackal    shackle    spackle    tackle    unshackle   

guinea-hen    unborrowed    bunched-up    phreaking    Jehu    cowbird    silver-backed    ridgepole    egret    stargazer