我的cobuild裡有查到這個字：Godspeed n. [formal]
The term "Godspeed" is sometimes used in order to wish
someone success and safety, especially if they are about
to go on a long and dangerous journey
ex: I know you will join me in wishing him godspeed.
a parting wish of success to a person starting on a journey
What does the quote "God speed" mean?
The expression is found only in 2 John 10, 11 in the King James
Version. "If there come any unto you, and bring not this doctrine,
receive him not into your house, neither bid him God speed: For
he that biddeth him God speed is partaker of his evil deeds."
Most recent translations render the Greek word "greeting."
It comes from a primary verb meaning to be cheerful.
It also has the meaning of "be well." Thus the idea is that to say
God speed or greeting is to wish someone well on his journey
or in whatever endeavor the person might be engaged. In the text
mentioned above John is warning against encouraging, or
wishing well false teachers. To bid the false teacher God speed,
or greeting, is to indicate that you are in agreement with that
teaching and you wish him success in continuing to teach that
false doctrine. However, to do this is to invite judgment from God.
What does "God Speed" mean?
This word "Godspeed" or "Goodspeed" is found in 2 John 10.
It is sometimes translated "greeting". This greeting "Chairo" was
an approval of the course being pursued by the one this greeted,
and included a desire for success in the effort attempted. It is
used in the context of extending Christian hospitality to teachers
and preachers and sharing their fellowship.
Good luck, Good-bye
Good speed 維持好的速度，一帆風順。