IPA: /ˈʌndəˌlaɪɪŋ/
KK: /ˈʌndərˌlaɪɪŋ/
Relating to something that is beneath the surface or fundamental to a situation, often not immediately obvious.
The underlying issues in the discussion were not addressed.
Underlying → It is formed from "under-" (meaning beneath) and "lying" (from the Old English "licgan", meaning to lie or be situated). The word "underlying" refers to something that is situated beneath or forms the basis of something else.
Think of something that is 'beneath' ('under-') and 'situated' ('lying') — that's why underlying means something that is beneath the surface or foundational.