The phrase "the go-ahead" is commonly used to mean approval or permission to proceed. There are several synonyms for this phrase that can be used to convey the same meaning, including clearance, authorization, green light, nod, sanction, consent, and blessing. These words can be used in different contexts, such as obtaining clearance for a project, receiving authorization to take a certain action, or getting a green light to move forward with a plan. Synonyms such as approval, support, or endorsement may also be used in some situations where the go-ahead is implied or understood. In all cases, these words convey the idea of being given permission or approval to proceed with something.