go-ahead
noun [ S ]
ukuspermission to start doing something or for an event or activity to happen:
the go-ahead to do sth Developers got the go-ahead to turn 42 acres of industrial land into housing development.
the go-ahead for sth Airbus wants half a dozen launch customers signed up before it gives the go-ahead for the new aircraft.
get/give/receive the go-ahead It applied for permission to launch the fund in December and received the go-ahead in May.