To set free or release from pledge or engagement; release from promise, engagement, or vow.
To release or set free from union, attachment, or connection; detach; loosen or unfasten, and set free; release: as, to disengage a metal from its gangue, or a garment from a clinging bramble; to disengage the mind from study.
In fencing, to carry or pass the point of (the weapon) from one side to the other over or under the adversary's, when the previous relative position or engagement of the blades is to the opponent's advantage. The movement is executed by describing with the point of the weapon a very small circle. Rolando (ed. Forsyth).
To withdraw; become separated.