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See more synonyms for undock on Thesaurus.com
verb (used with object)
  1. to uncouple (two spacecraft modules or a spacecraft and space station).
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verb (used without object)
  1. (of a spacecraft module or spacecraft) to uncouple.
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Origin of undock

First recorded in 1920–25; un-2 + dock1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018