1. present participle of underlay; placing something beneath or under another thing as support or foundation

Examples

• The contractor is underlaying the carpet with thick padding.
• She spent the morning underlaying the fabric with interfacing.
• The workers are underlaying the foundation with gravel.
• He is underlaying the map with cardboard for stability.
• The artist is underlaying the canvas with a base coat.
• They are underlaying the flooring with moisture barrier.