The Collaborative International Dictionary of English v.0.48:

Forsake \For*sake"\, v. t. [imp. Forsook; p. p. Forsaken; p.
   pr. & vb. n. Forsaking.] [AS. forsacan to oppose, refuse;
   for- + sacan to contend, strive; akin to Goth. sakan. See
   For-, and Sake.]
   1. To quit or leave entirely; to desert; to abandon; to
      depart or withdraw from; to leave; as, false friends and
      flatterers forsake us in adversity.
      [1913 Webster]

            If his children forsake my law, and walk not in my
            judgments.                            --Ps. lxxxix.
                                                  30.
      [1913 Webster]

   2. To renounce; to reject; to refuse.
      [1913 Webster]

            If you forsake the offer of their love. --Shak.

   Syn: To abandon; quit; desert; fail; relinquish; give up;
        renounce; reject. See Abandon.
        [1913 Webster]

WordNet (r) 3.0 (2006):

forsaking
    n 1: the act of forsaking [syn: forsaking, giving up]
    2: the act of giving something up [syn: abandonment,
       forsaking, desertion]