What is the meaning of Flicker?

An unsteady flash of light.

A short moment.

To burn or shine unsteadily, or with a wavering light.

To keep going on and off; to appear and disappear for short moments; to flutter.

To flutter or flap.

Any of certain small woodpeckers, especially of the genus Colaptes.

One who flicks.

Ellipsis of channel flicker (“remote control”).

Source: wiktionary.org