Related Clues:

• Go on and off, as a traffic light
• Go on and off, as a light
• Flip one's lid?
• Believe the bluff
• Miss the action, maybe
• Show fear
• Lose a staring contest
• Come unglued
• Lose in a confrontation, maybe
• Panic
• Show a yellow stripe
• Get cold feet
• Turn and run, e.g.
• Blow a gasket
• Back down