The Collaborative International Dictionary of English v.0.48:

Overlie \O`ver*lie"\, v. t. [imp. Overlay; p. p. Overlain;
   p. pr. & vb. n. Overlying.]
   To lie over or upon; specifically, to suffocate by lying
   upon; as, to overlie an infant. --Quain.
   [1913 Webster]

         A woman by negligence overlieth her child in her
         sleeping.                                --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

overlie
    v 1: lie upon; lie on top of; "the granite overlies the older
         rocks"
    2: kill by lying on; "The sow overlay her piglets" [syn:
       overlie, overlay]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "overlie":
   arch over, bestraddle, bestride, bridge, extend over, hang over,
   imbricate, jut, lap, lap over, lie over, overarch, overhang,
   overlap, override, ride, shingle, span