underlay

definition: a pad placed under a carpet
example:
speech part: noun
synonyms: carpet pad
definition: provide with a base, support, lining, or backing
example: underlay the boards with joists
speech part: verb
synonyms:
definition: put (something) under or beneath
example:
speech part: verb
synonyms:
definition: raise or support (the level of printing) by inserting a piece of paper or cardboard under the type
example: underlay the plate
speech part: verb
synonyms:

underlay is explained and pronounced

How underlay is being used?