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English definition of “lagging”

lagging

noun [U] uk   /ˈlæɡ.ɪŋ/ us  
a thick layer of material used to cover pipes, water tanks (= large containers), and other surfaces in order to stop heat from escaping or water from freezingBuilding materialsCoverings and layers
(Definition of lagging from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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