to take (a ship) out of a dock; to move or sail (a ship) out of a dock
undock in American English
(unˈdɑk)
Aerospace
transitive verb
1.
to uncouple (two spacecraft modules or a spacecraft and space station)
intransitive verb
2. (of a spacecraft module or spacecraft)
to uncouple
Word origin
[1920–25; un-2 + dock1]This word is first recorded in the period 1920–25. Other words that entered Englishat around the same time include: follow-up, montage, self-service, superpower, tie-inun- is a prefix freely used in English to form verbs expressing a reversal of some actionor state, or removal, deprivation, release, etc. (unbend; uncork; unfasten; etc.), or to intensify the force of a verb already having such a meaning (unloose)