verb (used with object), un·der·laid, un·der·lay·ing.
- to lay under or beneath.
- to provide with something laid underneath; raise or support with something laid underneath: The manufacturer underlays the chrome finish with a zinc coating.
- to extend across the bottom of.
- something underlaid.
- Printing. a piece or pieces of paper put under type or cuts to bring them to the proper height for printing.
verb (used with object), un·der·lay, un·der·lain, un·der·ly·ing.
- to lie under or beneath; be situated under.
- to be at the basis of; form the foundation of.
- Grammar. to function as the root morpheme or original or basic form of (a derived form): The form “boy” underlies “boyish.”
- Finance. to be primary to another right or security.
verb (ˌʌndəˈleɪ) -lays, -laying or -laid (tr)
- to place (something) under or beneath
- to support by something laid beneath
- to achieve the correct printing pressure all over (a forme block) or to bring (a block) up to type height by adding material, such as paper, to the appropriate areas beneath it
- a layer, lining, support, etc, laid underneath something else
- printing material, such as paper, used to underlay a forme or block
- felt, rubber, etc, laid beneath a carpet to increase insulation and resilience
verb -lies, -lying, -lay or -lain (tr)
- to lie or be placed under or beneath
- to be the foundation, cause, or basis ofcareful planning underlies all our decisions
- finance to take priority over (another claim, liability, mortgage, etc)a first mortgage underlies a second
- to be the root or stem from which (a word) is derived“happy” underlies “happiest”
v.Old English under lecgan “to support by placing something beneath;” see under + lay (v.). Related: Underlaid; underlaying. v.Old English under licgan “to be subordinate to, to submit to;” see under + lie (v.2). Meaning “to lie under or beneath” is attested from c.1600; figurative sense of “to be the basis of” is attested from 1852 (implied in underlying).