Answer:

GODSPEED

Answer	Crossword Clue
GODSPEED	Bon voyage, old-style
GODSPEED	"Good luck!"
GODSPEED	Wish for an embarking explorer

GODSPEED	"Bye!"
GODSPEED	Parting wish
GODSPEED	Parting wish.
GODSPEED	Word to a departing traveler
GODSPEED	Relative of "bon voyage"
GODSPEED	"Best of luck!"
GODSPEED	Wish to a traveler
GODSPEED	Success

GODSPEED	"Have a safe journey!"