flicker out
To become less powerful before ceasing altogether. When the lights flickered out, we knew the storm outside was to blame.
flicker out
[for a flame] to dwindle, little by little, until it goes out. The candle flickered out, leaving us in total darkness. When the last flame flickered out, the room began to get cold.
flicker out
v. To waver in intensity and then completely subside: The candle burned for an hour and then flickered out.