[go-ahead] adj (1834) 1: marked by energy and enterprise: progressive "a vigorous ~ company"
2: indicating that one may proceed "~ signal"
3: being a score that gives a team the lead in a game "drove in the ~ run"
[2]go-ahead n (1840) 1 a: energy, spirit "had a great deal of courage and ~" b: one possessing go-ahead
2: a sign, signal, or authority to proceed: green light