<p><strong>Verb</strong></p><ul><li>to burn unsteadily; shine with a wavering light; blink on and off.</li><li>to move to and fro; vibrate; quiver.</li><li>to flutter.</li><li>to appear or occur briefly.</li></ul><p><strong>Noun</strong></p><ul><li>an unsteady flame or light.</li><li>a flickering movement.</li><li>a brief occurrence or appearance.</li><li>Slang: flick 2.</li><li>Ophthalmology: the visual sensation of flickering that occurs when the interval between intermittent flashes of light is too long to permit fusion.</li></ul>