Meaning of UNDERLAY in English

UNDERLAY

v. & n.

v.tr. (past and past part. -laid) lay something under (a thing) to support or raise it.

n. a thing laid under another, esp. material laid under a carpet or mattress as protection or support.

[ OE underlecgan (as UNDER-, LAY(1)) ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.