Meaning of UNDERLAY in English

UNDERLAY

I. -ˈlā transitive verb

( un·der·laid -ˈlād ; -lay·ing )

Date: before 12th century

1. : to cover, line, or traverse the bottom of : give support to on the underside or below

2. : to raise or support by something laid under

II. ˈən-dər-ˌlā noun

Date: 14th century

: something that is or is designed to be laid under

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.