1an unsteady movement of a flame or light causing rapid variations in brightness:the flicker of a candle flame caught our eyes
[mass noun] fluctuations in the brightness of a film or television image such as occur when the number of frames per second is too small for persistence of vision.
2a tiny movement:the flicker of an eyelid
a brief feeling or indication of emotion:a flicker of a smile passed across her face
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Universal
1(of light or a source of light) shine unsteadily; vary rapidly in brightness:the interior lights flickered, and came on
(of a flame) burn fitfully, alternately flaring up and dying down:the candle flickered again (as adjective flickering)the flickering flames cast long shadows
(of an emotion) be felt or shown briefly or faintly:amusement flickered briefly in his eyes