1. 在…上覆盖（或铺、涂）
    If something is overlaid with something else, it is covered by it.

    e.g. The floor was overlaid with rugs of oriental design.
           地板上铺着东方风情的地毯。
    e.g. ...woollen cloth, overlaid with gold and silver embroidery.
           缝着金银绣花的呢子

2. 覆盖物；涂层
    You can use overlay to refer to a substance which covers the surface of something.

    e.g. Silver overlay is bonded to the entire surface.
           整个表面都镀了一层银。
    e.g. ...an overlay of snow on the tops of the iron fences.
           铁栅栏上落满的一层雪

3. （以某一情感、特性等）遮掩
    If something is overlaid with a feeling or quality, that feeling or quality is the most noticeable one, but there may be deeper and more important ones involved.

overlay是什么意思

    e.g. The party had been overlaid with a certain nervousness.
           这个聚会一直笼罩在不安的气氛中。
    e.g. ...a surge of feeling which at this moment overlaid all others.
           此刻突然迸发出来、盖过了其他种种情绪的情感

1. a layer of decorative material (such as gold leaf or wood veneer) applied over a surface

2. protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior

    Synonym: sheathingoverlayer

1. kill by lying on

    e.g. The sow overlay her piglets

    Synonym: overlie

2. put something on top of something else

    e.g. cover the meat with a lot of gravy

    Synonym: cover