The Collaborative International Dictionary of English v.0.48:

Encage \En*cage"\, v. t. [imp. & p. p. Encaged; p. pr. & vb.
   n. Engaging.] [Pref. en- + cage: cf. F. encager.]
   To confine in a cage; to coop up. --Shak.
   [1913 Webster]