(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 the synth arpeggios start, underlaid by a lovely theme on bass
noun
Pronunciation: /ˈʌndəleɪ/
[mass noun]
1something placed under or behind something else, especially material laid under a carpet for protection or support: providing the proper underlay gives the carpet extra life a polka-dot skirt with net underlay
2 Music the manner in which the words are fitted to the notes of a piece of vocal music.