Etymology

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Today it means: To levy certain exactions or tribute upon; to lodge and eat at the expense of. Full definition →

Irish cuid oíche
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The story

  1. Irish · derived fromcuid oíche“night's supper”
  2. English todaycosher

From Irish cuid oíche (“night's supper”) or cóisir (“banquet; festive party”).

Etymology from Wiktionary, CC BY-SA 4.0.