Definition of underlie verb from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌʌndəˈlaɪ//
; NAmE NAmE//ˌʌndərˈlaɪ//
Verb Forms present simple I / you / we / they underlie
BrE BrE//ˌʌndəˈlaɪ//
; NAmE NAmE//ˌʌndərˈlaɪ//
he / she / it underlies
BrE BrE//ˌʌndəˈlaɪz//
; NAmE NAmE//ˌʌndərˈlaɪz//
past simple underlay
BrE BrE//ˌʌndəˈleɪ//
; NAmE NAmE//ˌʌndərˈleɪ//
past participle underlain
BrE BrE//ˌʌndəˈleɪn//
; NAmE NAmE//ˌʌndərˈleɪn//
-ing form underlying
BrE BrE//ˌʌndəˈlaɪɪŋ//
; NAmE NAmE//ˌʌndərˈlaɪɪŋ//
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[no passive] underlie something (formal) to be the basis or cause of something These ideas underlie much of his work. It is a principle that underlies all the party's policies. see also underlying Word OriginOld English underlicgan ‘be subject or subordinate to’ (from under-, lie1).
See the Oxford Advanced American Dictionary entry: underlie