Source : Webster's Revised Unabridged Dictionary (1913)

Disengage \Dis`en*gage"\, v. t. [imp. & p. p. {Disengaged}; p.
   pr. & vb. n. {Disengaging}.] [Pref. dis- + engage: cf. F.
   d['e]sengager.]
   To release from that with which anything is engaged,
   engrossed, involved, or entangled; to extricate; to detach;
   to set free; to liberate; to clear; as, to disengage one from
   a party, from broils and controversies, from an oath,
   promise, or occupation; to disengage the affections a
   favorite pursuit, the mind from study.

         To disengage him and the kingdom, great sums were to be
         borrowed.                                --Milton.

         Caloric and light must be disengaged during the
         process.                                 --Transl. of
                                                  Lavoisier.

   Syn: To liberate; free; loose; extricate; clear; disentangle;
        detach; withdraw; wean.

Disengage \Dis`en*gage"\, v. i.
   To release one's self; to become detached; to free one's
   self.

         From a friends's grave how soon we disengage! --Young.

Source : WordNet®

disengage
     v 1: release from something that holds fast, connects, or
          entangles; "I want to disengage myself from his
          influence"; "disengage the gears" [syn: {withdraw}]
          [ant: {engage}]
     2: free or remove obstruction from; "free a path across the
        cluttered floor" [syn: {free}] [ant: {obstruct}]
     3: become free; "in neutral, the gears disengage" [ant: {engage}]