The Collaborative International Dictionary of English v.0.48:

Discase \Dis*case"\, v. t.
   To strip; to undress. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

discase
    v 1: get undressed; "please don't undress in front of
         everybody!"; "She strips in front of strangers every night
         for a living" [syn: undress, discase, uncase,
         unclothe, strip, strip down, disrobe, peel] [ant:
         apparel, clothe, dress, enclothe, fit out,
         garb, garment, get dressed, habilitate, raiment,
         tog]