Fallback
Part of speech: adjective
Definition: That can be resorted to as a fallback.
Part of speech: noun
Definition: An act of falling back. A backup plan or contingency strategy; an alternative which can be used if something goes wrong with the main plan; a recourse. A reduction in bitumen softening point, sometimes called refluxing or overheating in a relatively closed container.
Disengagement
Part of speech: noun
Definition: Release or detachment from a physical situation or other involvement.The separation or release of a chemical.Leisure; relief from responsibilities or onerous activities.Withdrawal from combat, confrontation, or the assertion of influence.Termination of an agreement to be married.A circular movement of the blade that blocks an opponent's parry.The emergence of the fetus from the birth canal.
Example sentence: Engagement is always better then disengagement. If we don't talk, somebody else will.