The phrase "ability to green-light" refers to the power or authority to approve or authorize a particular action or project. Some synonyms for this phrase include the ability to give the go-ahead, the ability to green-lit, the ability to authorize, and the ability to sanction. Other alternatives include the power to approve, the power to confirm, and the power to endorse. These synonyms all convey a sense of authority and decision-making ability, suggesting that the person with this power has the final say in determining whether a project is worth pursuing or not. Ultimately, having the ability to green-light is a crucial element of leadership and management.