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English definition of “undercoat”

undercoat

noun [C or U] uk   /ˈʌn.də.kəʊt/ us    /-dɚ.koʊt/
a first layer of paint that is put on a surface in order to improve the appearance of the final one, or the paint used for this: Those red walls will probably need two undercoats.
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Paints, dyes and pigmentsColour - general wordsCoverings and layers
(Definition of undercoat from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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