(of light or a source of light) shine unsteadily; vary rapidly in brightness

the interior lights flickered, and came on

make small, quick movements

her eyelids flickered

Forster's eyes flickered open

an unsteady movement of a flame or light causing rapid variations in brightness

the flicker of a candle flame caught our eyes

a tiny movement

the flicker of an eyelid

an American woodpecker that often feeds on ants on the ground