simple past tense of underlie

A layer (of earth, etc.) that lies under another; substratum. / A soft floor covering that lies under a carpet. / Anything that is underlaid.

(transitive) To lay (something) underneath something else; to put under. / (transitive) To provide a support for something; to raise or support by something laid under.

present participle of underlay

plural of underlay

Misspelling of underlaid.

plural of underlayer

To form a layer beneath another

A layer that is below another layer. / (mining) A perpendicular shaft sunk to cut the lode at any required depth. / One who underlays.

Something that is underlaid, such as planking in a room of a house; underlay.