·noun ·see Underlay, ·noun, 1.
II. Underlie ·vi To lie below or under.
III. Underlie ·vt To be subject or amenable to.
IV. Underlie ·vt To lie under; to rest beneath; to be situated under; as, a stratum of clay underlies the surface gravel.
V. Underlie ·vt To be at the basis of; to form the foundation of; to Support; as, a doctrine underlying a theory.