transitive verb-·laid′, -·lay′ing
- to cover, line, or extend over the bottom of: the leather is underlaid with felt
- to raise or support with something laid underneath: the roof must be underlaid with trusses
- Printing to provide with an underlay
Origin of underlayMiddle English underlein from Old English underlecgan
- something laid underneath
- Printing a patch or patches of paper laid under type, cuts, etc. to raise the level of the face
pt. of underlie
transitive verbun·der·laid, un·der·lay·ing, un·der·lays
- 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
- Simple past tense of underlie.
(third-person singular simple present underlays, present participle underlaying, simple past and past participle underlaid)
- To lay (something) underneath something else; to put under.
- To provide a support for something; to raise or support by something laid under.
- to underlay a cut, plate, or the like, for printing
- To put a tap on (a shoe).
- (mining, intransitive, of a vein, fault, or lode) To incline from the vertical; to hade.