plumb line

noun, verb — 3 senses

nounalso spelled plumb-line

Etymology From Middle English plumblyne, equivalent to plumb + line.

A cord with a weight attached, used to produce a vertical line; a plummet.

Any vertical reference line.

plumb-line

verb

Etymology From plumb line (noun).

To measure with a plumb line.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — authors: page histories for plumb line and plumb-line.