|—vb , -lies, -lying, -lay, -lain|
|1.||to lie or be placed under or beneath|
|2.||to be the foundation, cause, or basis of: careful planning underlies all our decisions|
|3.||finance to take priority over (another claim, liability, mortgage, etc): a first mortgage underlies a second|
|4.||to be the root or stem from which (a word) is derived: "happy" underlies "happiest"|
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