—v., -laid, -lay•ing,
1. to lay under or beneath.
2. to provide with something laid underneath; raise or support with something laid underneath: The manufacturer underlays the chrome finish with a zinc coating.
3. to extend across the bottom of.
1. something underlaid.
2. Print.a piece or pieces of paper put under type or cuts to bring them to the proper height for printing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.