Related Clues:

• Lose one's nerve
• Go on and off, as a traffic light
• Go on and off, as a light
• Flip one's lid?
• Miss the action, maybe
• Twinkle
• Lose a staring contest
• Lose in a confrontation, maybe
• Quiver
• Burn like a candle
• Back down
• Glimmer
• Bat both eyes
• Book subtitled 'The Power of Thinking Without Thinking'
• Burn or shine unsteadily