There are 2 definitions of underlay in English:

underlay1

Syllabification: un·der·lay

verb

Pronunciation: /ˌəndərˈlā
 
/
(past and past participle underlaid) [with object]
Place something under (something else), especially to support or raise it: the green fields are underlaid with limestone figurative a whine underlaid by an occasional choking sob
More example sentences
  • The national park experiences moorland fires most years and the land recovers quite quickly, although if a major fire takes hold and gets through to underlaying peat it could take years to rejuvenate the land.
  • This Finnish trio of cellists return with a driving and beautiful collection of songs featuring soaring string work underlaid by metal drumming and pre-programming to give the songs a searing edge.
  • Their disappointment and social difficulties underlaid their petitions and appeals to authority.

noun

Pronunciation: /ˈəndərˌlā
 
/
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1Something placed under or behind something else, especially material laid under a carpet for protection or support.
More example sentences
  • Building their masterpieces out of various recyclable materials such as carpet underlay, tyres, foam tubing, leather belts and other pieces of junk lying around the shed, the list of materials and techniques are endless.
  • The tyres will be turned into rubber crumbs and ploughed back into various industries to be used in sport, leisure, equestrian, civil engineering projects and carpet underlay.
  • The senior lecturer in environmental acoustics at the university, said the team will be looking at how to recycle old carpets into underlay.
1.1 Music The manner in which the words are fitted to the notes in a piece of vocal music.
More example sentences
  • Horns would generally remain in the harmonic underlay, and trumpets be used for moments of brightness and assertiveness: brass instruments at this date, without keys, were restricted to rather few notes.
  • Furnishing a secure, seamless underlay is, of course, the composer's role.
  • Despite the electronic underlay, the album seems to have more affinities with rock music than with most contemporary electronica.

Origin

Old English underlecgan (see under-, lay1).

Definition of underlay in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude

There are 2 definitions of underlay in English:

underlay2

Syllabification: un·der·lay
Pronunciation: /ˌəndərˈlā
 
, ˈəndərˌlā
 
/
Past tense of underlie.

Definition of underlay in: