Meaning of “undercoat” in the English Dictionary

british dictionary

"undercoat" in British English

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undercoatnoun [ C or U ]

uk /ˈʌn.də.kəʊt/ us /ˈʌn.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.

(Definition of “undercoat” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)