1. To release from something that holds together, connects, or entangles: When the mechanic disengages certain parts in an automobile, it won't function until it is replaced.
2. To free oneself from a task, a pledge, or an obligation: After being elected, some politicians disengage themselves from issues they promised to fulfill.
3. To choose or to detach oneself from something; to withdraw or to leave: The father disengaged his hand from that of his little son after he fell asleep.