Related Clues:

• Silent acknowledgment
• Tacit agreement
• Gesture of assent
• Quiet okay
• Silent signal
• Yes, to a mime
• Affirmative signal
• Nursery-rhyme angler
• Go out for a while
• Say yes, in a way
• Evince agreement
• Get sleepy-eyed
• Affirmation of a sort
• Sleepytime land
• Indicate assent