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English definition of “plumb line”

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plumb line

noun [C] uk   us  
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
Translations of “plumb line”
in Chinese (Traditional) (測垂直面或水深的)鉛垂線,錘線…
in Chinese (Simplified) (测垂直面或水深的)铅垂线,重锤线…
(Definition of plumb line from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of plumb line?
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