Definition of “plumb line” - English Dictionary

british dictionary

“plumb line” in British English

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plumb linenoun [ C ]

uk /ˈplʌm ˌlaɪn/ us /ˈplʌm ˌlaɪn/

a piece of string with a weight attached to one end, used either to test if something vertical, such as a wall, is exactly straight, or to find the depth of water

(Definition of “plumb line” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)