Longman Dictionary of Contemporary English homepage

overlay

1 verb
     
o‧ver‧lay1 past tense and past participle overlaid [transitive]
1 to cover or be on top of something
be overlaid with something
The wood is overlaid with silver.
2 if one quality, sound etc overlays another, it is added to it and is often stronger or more noticeable:
The roar of the engines was overlaid by a loud banging.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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