verb (used with object), disengaged, disengaging.
to release from attachment or connection; loosen; unfasten: to disengage a clutch.
to free (oneself) from an engagement, pledge, obligation, etc.: He accepted the invitation, but was later forced to disengage himself.
Military. to break off action with (an enemy).
verb (used without object), disengaged, disengaging.
to become disengaged; free oneself.

1605–15; < Middle French desengager, equivalent to des- dis-1 + engager to engage

disengagedness [dis-en-gey-jid-nis, -geyjd-] , noun
self-disengaging, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disengage (ˌdɪsɪnˈɡeɪdʒ)
1.  to release or become released from a connection, obligation, etc: press the clutch to disengage the gears
2.  military to withdraw (forces) from close action
3.  fencing to move (one's blade) from one side of an opponent's blade to another in a circular motion to bring the blade into an open line of attack

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1600 in figurative sense; 1660s in lit. sense of "detach," from dis- "do the opposite of" (see dis-) + engage (q.v.). Related: Disengaged.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Then pivot the hinge to disengage the roller from the track.
The hardest lesson for students to learn is to disengage themselves from the
  data and theories in social sciences.
After removing the nails from the siding, press downward to disengage its lower
  edge from the siding below.
The sudden imbalance of power, with only one engine operating, caused the
  autopilot to disengage and the plane to begin to fall.
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