The Collaborative International Dictionary of English v.0.48:

Betake \Be*take"\, v. t. [imp. Betook; p. p. Betaken; p. pr.
   & vb. n. Betaking.] [Pref. be- + take.]
   1. To take or seize. [Obs.] --Spenser.
      [1913 Webster]

   2. To have recourse to; to apply; to resort; to go; -- with a
      reflexive pronoun.
      [1913 Webster]

            They betook themselves to treaty and submission.
                                                  --Burke.
      [1913 Webster]

            The rest, in imitation, to like arms
            Betook them.                          --Milton.
      [1913 Webster]

            Whither shall I betake me, where subsist? --Milton.
      [1913 Webster]

   3. To commend or intrust to; to commit to. [Obs.]
      [1913 Webster]