The Collaborative International Dictionary of English v.0.48:

re-arm \re-arm\, re-arm \re-arm\v. t.
   To arm (a person, group, or country) again; as, After the
   war, the defeated country was not rearmed by the victors.
   Usually used without the hyphen.

   Syn: rearm.
        [WordNet 1.5] re-arm

The Collaborative International Dictionary of English v.0.48:

re-arm \re-arm\, re-arm \re-arm\v. i.
   To become armed again; as, after the war, the defeated
   country rapidly rearmed. Usually used without the hyphen.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

rearm
    v 1: arm again; "After the war, the defeated country was not
         rearmed by the victors"
    2: arm anew; "After the war, the defeated country was not
       allowed to rearm" [syn: rearm, re-arm]