underlain

Verb

underlie (third-person singular simple present underlies, present participle underlying, simple past underlay, past participle underlain)

1. (intransitive) To lie in a position directly beneath something.
2. (transitive) To lie under or beneath.
   • A stratum of clay underlies the surface gravel.
3. (transitive) To serve as a basis of; form the foundation of.
   • a doctrine underlying a theory

   Synonyms:

   underpin

4. (transitive) To be subject to; be liable to answer, as a charge or challenge.
   • The knight of Ivanhoe […] underlies the challenge of Brian der Bois Guilbert.1819 December 20 (indicated as 1820), Walter Scott, Ivanhoe; a Romance. […], volume (please specify |volume=I to III), Edinburgh: […] Archibald Constable and Co.; London: Hurst, Robinson, and Co....
5. To underlay.