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Definition of disengage for English Language Learners. : 1  to separate from someone or something. : 2  to stop being involved with a person or group : to stop taking part in something. : 3  to move (a mechanism or part of a machine) so that it no longer fits into another part.
disengagement - to break off a military action with an enemy. fallback, pullout. retreat - (military) withdrawal of troops to a more favorable position to escape the enemy's superior forces or after a defeat; the disorderly retreat of French troops.