1 [with object] separate or release (someone or something) from something to which they are attached or connected:I disengaged his hand from minethey clung together for a moment, then she disengaged herself
[no object] become released:the clutch will not disengage
2 [with object] remove (troops) from an area of conflict:the ceasefire gave the commanders a chance to disengage their forces [no object]:plans were already afoot for the Americans to disengage from the city
3 [no object] Fencing pass the point of one’s sword over or under the opponent’s sword to change the line of attack.
a disengaging movement.
disengage in other Oxford dictionaries
Definition of disengage in the US English dictionary