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English definition of “underlie”

underlie

verb [T]  /ˌʌn·dərˈlɑɪ/ (present participle underlying, past tense underlay  /ˌʌn·dərˈleɪ/, past participle underlain  /ˌʌn·dərˈleɪn/) us  
to be a cause of or strong influence on something: More fundamental economic problems may underlie last week’s stock market slide. Note: said esp. of a hidden cause or influence
(Definition of underlie from the Cambridge Academic Content Dictionary © Cambridge University Press)
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