[ uhn-der-lahy ]
/ 藢蕦n d蓹r藞la瑟 /
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See synonyms for: underlie / underlying on Thesaurus.com

verb (used with object), un路der路lay, un路der路lain, un路der路ly路ing.
to lie under or beneath; be situated under.
to be at the basis of; form the foundation of.
Grammar. to function as the root morpheme or original or basic form of (a derived form): The form 鈥渂oy鈥 underlies 鈥渂oyish.鈥
Finance. to be primary to another right or security.
Should you take this quiz on 鈥渟hall鈥 versus 鈥渟hould鈥? It should prove to be a quick challenge!
Question 1 of 6
Which form is used to state an obligation or duty someone has?

Origin of underlie

before 900; Middle English underlyen (v.), Old English underlicgan.See under-, lie2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2022

How to use underlie in a sentence

British Dictionary definitions for underlie

/ (藢蕦nd蓹藞la瑟) /

verb -lies, -lying, -lay or -lain (tr)
to lie or be placed under or beneath
to be the foundation, cause, or basis ofcareful planning underlies all our decisions
finance to take priority over (another claim, liability, mortgage, etc)a first mortgage underlies a second
to be the root or stem from which (a word) is derived"happy" underlies "happiest"

Derived forms of underlie

underlier, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012