UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈɡɒdˈspiːd/US:USA pronunciation: respellingUSA pronunciation: respelling(godspēd)

WordReference Random House Unabridged Dictionary of American English © 2020
God•speed  (godspēd),USA pronunciation n. 
  1. good fortune;
    success (used as a wish to a person starting on a journey, a new venture, etc.).
  • Middle English, in the phrase God spede may God prosper (you). See God, speed 1250–1300

Collins Concise English Dictionary © HarperCollins Publishers::
Godspeed /ˈɡɒdˈspiːd/ interj , n
  1. an expression of one's good wishes for a person's success and safety
Etymology: 15th Century: from God spede may God prosper (you)

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