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English definition of “overlay”

overlay

verb [T often passive] uk   /ˌəʊ.vəˈleɪ/ us    /ˌoʊ.vɚ-/ (overlaid, overlaid)
to cover something with a layer of something: The foundation of the house is built from rubble overlaid with concrete. be overlaid with sth literary something that is overlaid with something has a particular quality added to it that influences its character: Her new novel is overlaid with political concerns.

overlay

noun [C] uk   /ˈəʊ.və.leɪ/ us    /ˈoʊ.vɚ-/
a thin covering of something: The wood frame has a gold overlay.
(Definition of overlay from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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