1. 许可；批准
If you give someone or something the go-ahead, you give them permission to start doing something.

2. 有进取心的；具有开拓精神的
A go-ahead person or organization tries hard to succeed, often by using new methods.

1. readiness to embark on bold new ventures

Synonym: enterpriseenterprisingnessinitiative

2. a signal to proceed

Synonym: green light