這段對話中的give the go ahead有錯誤嗎？

Question

W: When will directors approve the purchase of the office building next door?
M: If their review of its current lease agreements is positive, they will give the go ahead.
W: This review process will probably take 6 to 10 days.

請問give the go ahead是正確的嗎？

所以環保媽咪的意思是說，口語中可以這樣用，但是正式文書與商業文件是不允許的嗎？

Answer 1

環保媽咪解釋的不錯.... 推~

Answer 2

我覺得環保媽咪解釋得很詳細 :)