say it: HAK-uhl
hackle is a noun and verb meaning "long slender feather on the necks of e.g. turkeys and pheasants". It carries 2 recorded senses.
long slender feather on the necks of e.g. turkeys and pheasants
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for hackle come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.