Related Clues:

• Grows darker
• Makes faint
• Lowers the wattage on
• Turns down, as a lamp
• Keeps getting darker
• Becomes faint
• Turns down, as a light
• Reacts to sunlight, as transition lenses
• Grows dimmer
• Adjusts lights, as for romantic effect
• Lowers, as a light
• What the moon does during a lunar eclipse
• Drake at sea, heading for one pole then another, becomes gloomy
• One refuge amongst others gets less light
• Lowers with a switch