Related Clues:

• Indicate agreement
• Yes
• Nod, say
• Give one's OK
• Give an OK
• Compliance
• What a green light may represent
• Agree-ment
• Nod of the head, for one
• Accede, agree
• Agree, concur
• Permit or approve
• Agreement or concurrence
• Acquiesce, comply
• Acquiesce, agree