Related Clues:

• Bid, perhaps
• Goofed
• Signaled approval
• Assented, in a way
• Agreed
• Signed an agreement?
• Grew sleepy
• Agreed, in a way
• Silently agreed
• Signaled assent
• Assented with head movement
• Assented with the head
• Indicated assent
• Indicated assent or recognition
• Bent the head in sleepiness