I. ˈgō-ə-ˌhed adjective
Date: 1834
1. : marked by energy and enterprise : progressive
a vigorous go-ahead company
2. : indicating that one may proceed
go-ahead signal
3. : being a score that gives a team the lead in a game
drove in the go-ahead run
II. noun
Date: 1840
1.
a. : energy , spirit
b. : one possessing go-ahead
2. : a sign, signal, or authority to proceed : green light