To lay beneath; to put under.
- To put (one thing) under another.
- To provide with a base or support.
- Printing To raise or support (the level of a bed) by inserting a piece of paper or other material under the type.
- Something, such as felt under a carpet, that is underlaid. Also called underlayment.
- Printing Paper or other material used to underlay.
- Past tense of underlie.