To become less powerful before ceasing altogether. When the lights flickered out, we knew the storm outside was to blame.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
[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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To waver in intensity and then completely subside: The candle burned for an hour and then flickered out.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.