If you give someone or something the go-ahead, you give them permission to start doing something.
例句
The Greek government today gave the go-ahead for five major road schemes...希臘政府今天批準了5項重大的道路修建方案。Don't do any major repair work until you get the go-ahead from your insurers.除非經保險公司同意，否則不要進行任何大修。
ADJ-GRADED
有進取心的；具有開拓精神的
A go-ahead person or organization tries hard to succeed, often by using new methods.