A nickname or informal name for someone named Jack, or historically a derogatory term (now considered offensive) referring to Aboriginal Australians.
As a nickname, it's a diminutive of 'Jack' (from 'John'). The term used for Aboriginal people is a harmful colonial-era slur that reflects the racist language patterns of European settlement in Australia.
This word shows how language carries historical harm—it was used as a dehumanizing label that reflected colonial attitudes, and its problematic past is why understanding word etymology matters for recognizing how prejudice gets embedded in everyday language.
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