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English definition of “overlay”

overlay

verb [T often passive]     /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.Covering and adding layers 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.Covering and adding layers
(Definition of overlay verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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