I. ˈgo-ahead 1 BrE AmE noun
give (somebody) the go-ahead/get the go-ahead to give or be given permission to start doing something:
The company has been given the go-ahead to build a new supermarket.
II. go-ahead 2 BrE AmE adjective [only before noun] British English
using new methods or ideas and therefore likely to succeed:
a go-ahead company