What does flickering mean?

What does flickering mean, flickering means rapid, unsteady, wavering, fluttering movement or light that goes on and off quickly, not steady, but goes bright then dim fast, like candle flame flickering in wind, going up and down, or light bulb flickering when loose. Flickering can describe light that blinks quickly, flame that wavers, eyelid that twitches quickly, or hope that is fading. As verb, flickering is present participle of flicker meaning to shine unsteadily. As adjective, flickering light means unsteady light. Flickering can also mean bird Northern flicker woodpecker that flashes yellow or red underwings when flying, creating flicker of color. In general, flickering means quick, repeated, unsteady flashing or fluttering, whether light, flame, movement, or feeling, indicating instability or not constant. For example, stars flickering means stars twinkling on and off, screen flickering means screen flashing, eyelid flickering means rapid twitching. So flickering means unsteady wavering flashing that goes on and off quickly, not steady, with synonyms like twinkling, shimmering, fluttering, and wavering, describing anything that is not constant but flutters quickly.