The term 'give the go-ahead to' can be expressed in three different ways using crossword solutions. The first solution is 'APPROVE, ' which is seven letters long. This means to give formal or official permission for something to happen. The second solution is 'authorize, ' which is nine letters long. This means to give someone the power to do something. The third solution is 'LET, ' which is three letters long. This means to allow something to happen. All three of these solutions express the same idea of giving permission for something to happen.