Parasmaipada विशति, (Epic also Atmane-pada that the rest of a word is to be suppliedते), to approach near to, associate or attach one's self to (accusative or instrumental case) fg-veda VS.; to enter together, enter into (accusative, rarely locative case) Kaus3. MBh. etc.; to merge one's self into (accusative) MBh.; to lie down, rest, repose in or upon (locative case or उपरि in fine compositi or 'at the end of a compound'), sleep with (instrumental case with and without सह, or dative case) S3Br. etc.; to cohabit, have sexual intercourse with (accusative) Mn. Ya1jn5. Ma1rkP.; to sit down with (accusative) Hariv.; to engage in, have to do with (accusative) BhP. : Causal -वेशयति, to cause to lie together or down or on Ya1jn5. Scholiast or Commentator; to place or lay together or on, bring to (locative case) Kaus3. MBh. etc.
Source: Monier-Williams