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What is another word for underlay?

What's another word for underlay? | Here's a list of synonyms for underlay.

Definition 1: a pad placed under a carpet - [noun denoting artifact]

Definition 1: provide with a base, support, lining, or backing - [verb of consumption]

Definition 1: put (something) under or beneath - [verb of contact]

Definition 1: raise or support (the level of printing) by inserting a piece of paper or cardboard under the type - [verb of motion]