Meaning of UNDERLAY in English

UNDERLAY

1. 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.

Etymology: OE underlecgan (as UNDER-, LAY(1)) 2. past of UNDERLIE.

Oxford English vocab.      Оксфордский английский словарь.