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English definition of “go-ahead”

go-ahead

noun [S]    
permission 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.
(Definition of go-ahead noun from the Cambridge Business English Dictionary © Cambridge University Press)
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