Etymology

plumb line

Today it means: A cord with a weight attached, used to produce a vertical line; a plummet. Full definition →

Middle English plumblyne
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The story

  1. Middle English · inherited fromplumblyne
  2. English todayplumb line

From Middle English plumblyne, equivalent to plumb + line.

Etymology from Wiktionary, CC BY-SA 4.0.