The Collaborative International Dictionary of English v.0.48:

Portcullis \Port*cul"lis\, v. t. [imp. & p. p. Portcullised;
   p. pr. & vb. n. Portcullising.]
   To obstruct with, or as with, a portcullis; to shut; to bar.
   [R.] --Shak.
   [1913 Webster]