verb (used with object), un·der·lay, un·der·lain, un·der·ly·ing. to lie under or beneath; be situated under. to be at the basis of; form the foundation of.

Is underlie a noun verb or adjective?

transitive verb. 1 : to lie or be situated under. 2 : to be at the basis of : form the foundation of : support ideas underlying the revolution.

Is underly a verb?

verb Alternative spelling of underlie .