Etymology

birthtongue

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Today it means: One's first language, learnt in early childhood; native language. Full definition →

Middle English burþe tonge
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The story

  1. Middle English · inherited fromburþe tonge
  2. English todaybirthtongue

From Middle English burþe tonge, equivalent to birth + tongue.

Etymology from Wiktionary, CC BY-SA 4.0.