Etymology

jackeen

J8A1C3K5E1E1N1

Today it means: An arrogant lower-class person, especially in Dublin; (hence), a Dubliner, especially as contrasted with someone from a rural area. Full definition →

First used 19th c.
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The story

From Jack + -een (“little”), from Jack being a common English name.

First known use, by meaning

  • from 19th c. An arrogant lower-class person, especially in Dublin; (hence), a Dubliner, especially as contrasted with someone from a rural area.

Etymology from Wiktionary, CC BY-SA 4.0.