'Godspeed is a nominalization of the phrase God speed (you), understanding which depends on two things: speed in this sense means 'to prosper; succeed', which is now archaic, but which is the original sense of the word; and the verb is subjunctive, expressing a wish, with the entire phrase meaning "may God cause you to succeed." Semantic parallels are such common expressions as God bless you or God forbid!; another nominalization is goddamn (as in "I don't give a good goddamn what you think"), shortened from God damn you.'
http://www.randomhouse.com/wotd/index.pperl?date=19980129 |