The definition of black Irish is used to describe Irish people with dark hair and dark eyes thought to be decedents of the Spanish Armada of the mid-1500s, or it is a term used in the United States by mixed-race descendants of Europeans and African Americans or Native Americans to hide their heritage.
An example of Black Irish is a person from Ireland with black hair and brown eyes.
(plural black Irish)
- (chiefly US) Any dark-haired person of Irish or mixed Irish descent.
From black (“black haired”)