The Collaborative International Dictionary of English v.0.48:

Embower \Em*bow"er\, v. t.
   To cover with a bower; to shelter with trees. [Written also
   imbower.] [Poetic] --Milton. -- v. i. To lodge or rest in a
   bower. [Poetic] "In their wide boughs embow'ring. "
   --Spenser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

embower
    v 1: enclose in a bower [syn: embower, bower]