- undock⇄undock, transitive verb.
1. to take (a ship) out of a dock.
2. to separate (a spacecraft) from another in space.
Ex. Conrad undocked Gemini and used his thrusters to back slowly away from the Agena (Time). - undock⇄v.i. to come out of docking.
Ex. Cosmos 212 and 213 docked, coasted and undocked in orbit automatically (Science News).