godspeed

Short definition from Wiktionary

Interjection

1. 1
   Alternative letter-case form of Godspeed.
2. 2
   Used, especially at a parting, to express the wish that the outcome of a person's actions be positive for them; typically said to someone who is about to start a journey or a daring endeavour.

Noun

1. 1
   Alternative letter-case form of Godspeed.
2. 2
   The wishing of someone a smooth journey, or success, especially at a parting; (countable) a statement expressing this.
3. 3
   Chiefly in in the Godspeed of: the most important part of something, or point at which something happens; also, the last minute or last moment.
4. 4
   In back of Godspeed: a distant, remote, or unknown place.