Etymology

outflow

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Today it means: The process of flowing out. Full definition →

Middle English outflowen ← Old English ūtflōwan
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The story

  1. Old English · inherited fromūtflōwan
  2. Middle English · inherited fromoutflowen
  3. English todayoutflow

From Middle English outflowen, from late Old English ūtflōwan (attested in the past tense as ūt flēow), equivalent to out- + flow. The noun is derived from the verb.

Etymology from Wiktionary, CC BY-SA 4.0.