verb transitiveWord forms: ˌunderˈlaid or ˌunderˈlaying
1. to cover, line, or extend over the bottom of
⇒ the leather is underlaid with felt
2. to lay (something) under something else, esp. as a support, wedge, etc.
3. to raise or support with something laid underneath
⇒ the roof must be underlaid with trusses
4. Printing to provide with an underlay
5. something laid underneath
6. Printing a patch or patches of paper laid under type, cuts, etc. to raise the level of the face
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'underlay'ME underlein < OE underlecgan