The Collaborative International Dictionary of English v.0.48:

Reassign \Re`as*sign"\ (r[=e]`[a^]s*s[imac]n"), v. t.
   To assign back or again; to transfer back what has been
   assigned.
   [1913 Webster]

WordNet (r) 3.0 (2006):

reassign
    v 1: transfer somebody to a different position or location of
         work [syn: transfer, reassign]