The Collaborative International Dictionary of English v.0.48:

Bestir \Be*stir"\, v. t. [imp. & p. p. Bestirred; p. pr. & vb.
   n. Bestirring.]
   To put into brisk or vigorous action; to move with life and
   vigor; -- usually with the reciprocal pronoun.
   [1913 Webster]

         You have so bestirred your valor.        --Shak.
   [1913 Webster]

         Rouse and bestir themselves ere well awake. --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bestir
    v 1: become active; "He finally bestirred himself" [syn:
         bestir, rouse]