Among the currently most popular synonyms for go-ahead are: ambitious, modern, permit, bold, green light, seal of approval, entrepreneurial, accreditation, disruptive, mandate, up-and-coming, enthusiastic, forward-looking, leave, rising, rubber stamp, dispensation, inventive, progressive, sanction, authorization, imaginative, imprimatur, adventurous, acquiescence, daring, agreement, avant-garde, innovative, blessing, consent, assent, acceptance, license, enlightened, driven, vital, right, approbation, permission, courageous, approval, advanced, audacious, energetic, high-powered, warrant, intrepid, pioneering, clearance, new, original, vigorous, nod, dynamic, creative, resourceful, liberal, power, authority, endorsement, ingenious, enterprising, spirited.